1. About Our Products

  • We offer two types of Umaku Nureru -- one for the finish coat and one for the undercoat. For most indoor surfaces, Umaku Nureru (For Finish Coat) is all you will need. Some indoor surfaces (and outdoor walls), however, will require coating with Umaku Nureru (For Undercoat) before they are finished with Umaku Nureru (For Finish Coat).
    See the table below for details.

Different Surfaces and the Product(s) You should Use (〇= Required)

Surface Umaku Nureru (For Finish Coat) Umaku Nureru (For Undercoat)
Vinyl wallpaper -
Japanese-style walls (fiber walls/ sand walls/ kyokabe/ shikkui walls/ earth walls) -
Gypsum plaster boards -
Plywood/ decorated plywood
Concrete blocks/ mortar/ concrete
Surfaces finished with paint
Interior tiles

1. Color variations

  • Cream

  • Yellow

  • White

  • Powder Gray

  • Cherry Blossom Pink

  • Orange

  • Bright Green

  • Yellow Ocher

  • Aqua

  • Pink

  • Bengala

  • Black

Because Umaku Nureru is a natural material, the color of the finished surface may differ slightly depending on factors including how it is applied and the work environment (temperature, humidity, and sunlight). These differences produce the distinctive flavor of a surface coated with a natural material.
*Actual colors will differ slightly from the above.

2. 18kg can, 5kg can, and 700g tube

We offer three options – an 18kg can, a 5kg can, and a 700g tube – offering users a flexible choice depending on the area of the surface that they intend to plaster. The areas that can be coated with the respective sizes are as follows.

*To obtain a coating thickness of 1mm, apply the product thinly enough that the original surface can be seen through the plaster, and then apply another thin coat on top of this with a scraping motion. If you are a new user, we recommend that you stir the product lightly with a trowel, or knead it with your hands (wearing rubber gloves). This will make the plaster soft and easier for you to apply thinly.

3. How much to use

Choose the 18kg can, 5kg can, or tube depending on the area of the surface to which you will apply Umaku Nureru. The areas that can be coated with the respective sizes are as follows.

  1. 1.
    About
    Our Products
  2. 2.
    Preparations
    for Work
  3. 3.
    Key Points
    for Applying Plaster
    Like a Pro
  4. 4.
    How to Apply
    Plaster to
    Different Surfaces
  5. 5.
    Precautions

2. Preparations for Work

1. What tools to use

The following tools are recommended for use with Umaku Nureru .

  • Umaku Nureru Trowel

    Makes plastering a dream!

  • Umaku Nureru Corner Trowel

    A trowel that allows you to plaster corners cleanly and smoothly

  • Umaku Nureru Hawk

    A lightweight hawk that prevents spilling

  • Umaku Nureru Tape

    For reinforcing the joints of gypsum and plywood boards

  • Pallet (rubber/ plastic)

    A commercial pallet will help you to plaster every inch of a surface.

  • Rubber gloves

    Make sure that you wear rubber gloves so that your hands do not come in contact with the material.

  • Masking tape

    Ensures that you don’t get plaster on the surroundings, such as pillars and edges

  • Corona masker

    Ensures that you do not get plaster on the floor during work

  • Scoop/ Large spoon

    For scooping out the plaster and placing it on the hawk

  • Download Leaflet

Umaku Nureru Trowel

The Umaku Nureru Trowel was designed to allow even inexperienced users to apply shikkui easily.

  • [Flexible]

    The Umaku Nureru Trowel is highly flexible, and allows even non-professional users to spread shikkui easily across wide areas.

  • [Soft]

    The entire blade, from the tip to the sides, is soft. This means that it can be used for uneven surfaces.

  • [Hard to break]

    Made of a special resin, the blade is soft but hard to break.

  • [Rustproof]

    The mounting of the trowel is rustproof, so you don’t have to worry about staining the wall with rust.

[Note] Only use the Umaku Nureru Trowel for applying shikkui. NEVER use it to scoop the plaster from the container. Doing so may cause the trowel to break. Do not apply the plaster with too much force. Doing so may cause the trowel to break. If you have never used a trowel before and feel that the plaster is a bit too hard, stir it lightly with the trowel or knead it with your hands (wearing rubber gloves). This will make the plaster softer.

Umaku Nureru Corner Trowel

Use this tool to ensure clean lines at corners (both inner and outer corners). Apply the material all over the corner with a trowel and pallet, and then use the Corner Trowel to flatten and smooth the surface.

  • [ Ideal for corners]

    The trowel allows any user to finish corner surfaces cleanly and easily.

  • [Flattening and smoothing]

    The rounded top corners of the trowel allow you to easily flatten and smooth the surface, without dragging the plaster.

  • [Easy for anyone to use]

    Made of a soft plastic, the trowel is easy to handle.

Umaku Nureru Hawk

Scoop the plaster out of the container and place it on the Umaku Nureru Hawk before applying it with the trowel. Use of the hawk makes the plastering work easier and more efficient.

  • [Makes it easy to position the hawk and scoop plaster onto the trowel]

    The bent surface makes it very easy to position the hawk and scoop plaster onto the trowel.

  • [Less spillage]

    The bent surface also means less plaster spillage.

  • [Easy for anyone to use]

    The hawk is lightweight and has a handle that is easy to grip. The angle and size of the handle are designed for ease of use.

2. How to open the container

Umaku Nureru comes in tightly-sealed containers because it hardens when exposed to air. The method of opening the container differs for the 18kg can, 5kg can, and tube. Follow the instructions below.

  • How to open the 18kg can

    • 1. Insert a finger into the rightmost ring

      Hold the container and insert a finger into the rightmost of the three rings.

    • 2.Pull the ring

      Pull the rightmost ring and remove the strip around the container.

    • 3. Remove the lid by pulling up the rings

      Hold down the lid and pull up the remaining two rings.

    • 4. Remove the film

      Remove the film, and you can start working.

  • How to open the 5kg can

    • 1. Pull up the edge of the lid with your finger

      Pull up the edge of the lid towards you with your finger.

    • 2.Pull up the entire edge of the lid

      Pull up the entire edge of the lid.

    • 3. Remove the lid

      The lid can be removed easily when you have pulled up the edge towards you.

    • 4. Remove the film

      Run your fingertip across the film to lift it off the plaster, and it will be easy to remove.

    • How to open the Umaku Nureru tube

      • Open the cap and remove the silver foil. If you want to use a large quantity of the plaster at one time, remove the star-shaped inner cap as well; this allows you to squeeze out a lot of plaster at once. If there is any plaster left over, put the cap back on the tube without straightening it out (letting air into the tube will cause the plaster to become hard) and store it.

    • Storing leftover plaster for future use

      • Both the 18kg can and 5kg can come with a film covering the surface of the plaster. If there is any plaster left over after you finish work, cover the surface with the film again, put the lid back on the container, and store it for future use. The plaster will not harden unless it is exposed to air. You can reuse it at any time as long as it is stored in a place where it will not freeze.

3. Clothes to wear, cleaning, and protection

  • [Clothes that you can get dirty]

    Umaku Nureru can be removed from clothes relatively easily by washing it off with water. However, be sure to wear clothes that you don’t mind getting dirty when applying the plaster.

  • [Rubber gloves]

    Be sure to wear rubber gloves when applying the plaster.

  • [Protective glasses]

    Be sure to wear protective glasses when plastering a ceiling.

  • [Cleaning the surface]

    The surface to be plastered must not be greasy. Remove greasy dirt from the surface with sandpaper, etc. before plastering work. Dust and dirt must also be removed before plastering work. Exterior concrete blocks may have mold or algae on them. Remove as much of this as possible with a scrubbing brush before applying Umaku Nureru. We recommend removing mold on interior surfaces with a mold remover before plastering work.

  • [Protection](Preparations to ensure that you don’t drip plaster on the surroundings)

    Making preparations for plastering is very important. Although it is a bit troublesome, proper protection will ensure that the plastered surface looks much better. The various steps involved in preparing for plastering work are explained in detail below.

4. Preparing for plastering work

    • Floor protection

      It is essential to protect your floor when plastering to ensure that you don’t get it dirty. It is also important to protect the boundary between the floor and the wall (and the wall and the baseboard). Use of both a corona masker and masking tape is optimal in ensuring that you do not dirty the boundaries. Use masking tape to cover the boundary between the wall and the baseboard. Apply a corona masker to the boundary between the baseboard and the floor.
      Stretch the corona masker film on the floor and affix newspaper or a ground sheet to it.

      • ▲ A floor protected with a corona masker

      • ▲ You can also use newspaper to protect the floor.

    • Protecting wall edges with tape

      Use masking tape to protect wall edges, or the boundaries of the wall with pillars, baseboards, door frames, window frames, and crown molding. First, apply the masking tape leaving a gap of 2-3mm between the edge of the tape and the wall, so that the tape will not be covered by the plaster. Stretch the tape when applying it. Press the tape with your fingers after applying it to ensure that it will adhere firmly. Be sure to remove the masking tape immediately after applying the second coat.

      • ▲ Leave a gap of 2-3mm between the edge of the masking tape and the wall.

      • ▲ Remove the tape immediately after applying the second coat.

  1. 1.
    About
    Our Products
  2. 2.
    Preparations
    for Work
  3. 3.
    Key Points
    for Applying Plaster
    Like a Pro
  4. 4.
    How to Apply
    Plaster to
    Different Surfaces
  5. 5.
    Precautions

3. Key Points for Applying Plaster Like a Pro

  • It is probably the case that many of our customers will never have used a trowel before. But don’t worry, applying plaster with a trowel is fun. And using the Umaku Nureru Trowel makes applying plaster easy and enjoyable for everyone. Please read the following instructions and then watch the video at the right.

1. How to use the trowel

  • Soften the plaster on the hawk

    Place Umaku Nureru plaster on the hawk. Adjust to your preferred softness by kneading it gently, without using any additives.

  • Place the plaster on the trowel

    The edge of the hawk is bent so that it is easy to scoop plaster onto it. Scoop up the plaster and move it in the direction of the bent edge of the hawk.

  • Apply the plaster to a wall or ceiling

    Apply the Umaku Nureru with a scraping motion, moving the trowel from left to right and from the bottom to the upper right.

  • Apply the plaster smoothly by inclining the trowel

    Inclining the trowel by 20 degrees in relation to the wall will allow you to apply the plaster smoothly.

Umaku Nureru shikkui plaster is a dense and highly viscous material. It will not drip even if you apply a large amount to a wall. And in fact, applying a lot of plaster to the wall at once and spreading it evenly with your trowel is one way to plaster a wall.

  • 2. Applying the plaster with rubber gloves

    Wear rubber gloves, scoop the Umaku Nureru out of the container by hand, and apply it directly to the wall using your hands. Don’t hold back – just think of the wall as a canvas. Continue applying and spreading the plaster. It really is easy, and the finish will turn out surprisingly beautiful and natural. You don’t have to worry about the plaster coming off.

  • 3. Adjusting the plaster to your preferred softness by kneading it

    Umaku Nureru will feel dense and hard when you first open the container. You can adjust the plaster to your preferred softness without adding water. Knead the material gently by hand (wearing rubber gloves) or with a trowel, and it will soften quickly. This is recommended if you have never applied a plaster with a trowel before or the plaster is a little too hard. But when you are used to using the material and acquired the knack of plastering, you will find it easier to use unkneaded than kneaded plaster.
    *The viscosity of the plaster may differ slightly from can to can. This is not a quality problem. You can still use the plaster as you normally would, and finish the surface without problems.

4. How to apply Umaku Nureru to corners

  • All walls have flat areas (flat surfaces) and edges, i.e. corners. When plastering, apply plaster to the corners first, before the flat surfaces. This is essential if you want to plaster the walls cleanly, without leaving any part uncoated. A pallet is convenient for applying plaster to corners. It enables you to spread the plaster to the furthest sections of the wall. Coat the corners and then the flat surfaces with the Umaku Nureru Trowel. Next, finish the corners (both inner and outer corners) cleanly using the Umaku Nureru Corner Trowel. Flatten and smooth the inner and outer corners with this specially-designed trowel. But remember, the Umaku Nureru Corner Trowel is not for applying plaster, but for flattening and smoothing the plaster when it is applied to corners.

    To learn how to apply plaster to corners, please read the following instructions and then watch the video at the right.

  • Applying plaster to an inner corner

    • Apply the plaster to the corner

      Apply two coats of the plaster to the corner, in the same way as you would to a flat surface.

    • Apply the plaster with the protruding part of the trowel

      Press the corner with the tip of the Corner Trowel using a moderate pressure immediately after recoating it.

    • Flatten and smooth the material

      Flatten and smooth the plaster by spreading it downward with the tip of the trowel.

    • Finish

      Finally, use the Umaku Nureru Trowel to flatten and smooth the edge of the section that you finished with the Corner Trowel. You’re done!

  • Applying plaster to an outer corner

    • Apply the plaster to the corner

      Apply two coats of the plaster to the corner, in the same way as you would to a flat surface.

    • Apply the plaster with the concave part of the trowel

      Press the corner with the tip of the Corner Trowel using a moderate pressure immediately after recoating it.

    • Flatten and smooth the material

      Flatten and smooth the plaster by spreading it downward with the tip of the trowel.

    • Finish

      Finally, use the Umaku Nureru Trowel to flatten and smooth the edge of the section that you finished with the Corner Trowel. You’re done!

5. Apply two coats of Umaku Nureru (For Finish Coat)

We recommend that you apply two coats of plaster to any surface using Umaku Nureru (For Finish Coat). First, apply a thin coat to the surface with a scraping motion. Apply it thinly enough that the original surface can be seen through the plaster. It doesn’t matter if the coat is uneven at this point. Leave the surface for a while, until it is half-dry (the color will be lighter). When the surface is half-dry, the material will not adhere to your fingers even if you touch it. Start recoating the surface now*. Recoat the entire surface, and you’re done.
*If the product is applied to a Japanese-style wall, plaster scum or stains may appear after the first coat. Do not recoat the surface until the following day in this case.

If there is a long period between the application of the first and second coats, we recommend that you spray the surface with water from an atomizer to moisten it before applying the second coat. This will make the second coat easier to apply.

Why two coats?
  • In many cases, when you apply two thin coats, you use less plaster than when you apply a single coat, and you only need to use the specified quantity of the material. If you try to finish plastering a surface with only a single coat, you tend to apply a thick coat, because you are trying not to leave any area uncoated.
  • Depending on the original surface, plaster scum or cracks may appear after the first coat. They will disappear when the surface is recoated.
  1. 1.
    About
    Our Products
  2. 2.
    Preparations
    for Work
  3. 3.
    Key Points
    for Applying Plaster
    Like a Pro
  4. 4.
    How to Apply
    Plaster to
    Different Surfaces
  5. 5.
    Precautions

4. How to Apply Plaster to Different Surfaces

1. Vinyl wallpaper

  • Umaku Nureru (For Finish Coat) can be applied directly to vinyl wallpaper, including wallpapers with a paper or fabric surface. Follow the steps below for all types of vinyl wallpaper.

  • Clean the surface and prepare the area for the plastering work

    Wipe the vinyl wallpaper surface with a wet cloth, and remove any greasy dirt. Do not forget to apply tape, corona maskers, ground sheets, etc. to prepare for plastering.

  • Cut off peeling areas

    Cut off peeling areas of the vinyl wallpaper and hold the edge in place with tacker staples or screws. Applying Umaku Nureru directly to tacker staples or screws will not cause them to rust.

  • Apply the first coat (Umaku Nureru For Finish Coat)

    Apply Umaku Nureru (For Finish Coat) on the vinyl wallpaper with a scraping motion, thinly enough that the wallpaper can be seen through the plaster.

  • Apply the second coat (Umaku Nureru For Finish Coat)

    Leave the surface for 1 to 2 hours after the first coat, until it is half-dry, with its color growing lighter gradually. When the surface is half-dry, the material will not adhere to your fingers even if you touch it. Start recoating the surface now. Apply a thin coat of Umaku Nureru (For Finish Coat) to the entire surface again, and you’re done.

*Do not apply plaster to vinyl wallpaper on a ceiling. Remove the vinyl wallpaper before applying the plaster to the ceiling.
*In extremely rare cases, plastering on vinyl wallpaper may produce an odor. This odor is not harmful.

2. A surface from which vinyl wallpaper has been removed

Normally, vinyl wallpaper consists of two layers – a cover sheet and a backing sheet. Start by removing the entire cover sheet and backing sheet. The steps to take when applying shikkui on a surface after removing vinyl wallpaper are as follows.

  • Remove the cover sheet

    The cover sheet is what you can see on the surface of the wallpaper. The cover sheet is easy for anyone to remove – just peel it off starting from an edge. Remove the entire sheet.

  • Remove the backing sheet

    This task is a bit more troublesome. Backing sheets are hard to remove, but they can be peeled off slowly after absorbing water. We can make use of this property by lightly squeezing out a wet cloth, and wiping the entire surface of the backing sheet. You will see that the backing sheet starts to peel or detach from the surface in a few places. Starting from these peeling areas, scrape off the backing sheet with a scraper. Try to minimize damage to the gypsum board under the backing sheet.

  • Apply the first coat (Umaku Nureru For Finish Coat)

    The remaining steps are the same as steps (3) and (4) for “Vinyl wallpaper” above. Apply Umaku Nureru (For Finish Coat) to the surface with a gentle scraping motion, thinly enough that the original surface can be seen through the plaster.

  • Apply the second coat (Umaku Nureru For Finish Coat)

    Leave the surface for 1 to 2 hours after the first coat, until it is half-dry, with its color growing lighter gradually. When the surface is half-dry, the material will not adhere to your fingers even if you touch it. Start recoating the surface now. Apply a thin coat of Umaku Nureru (For Finish Coat) to the entire surface again, and you’re done.

3. Japanese-style walls (fiber walls/ sand walls/ kyokabe/ shikkui walls/ earth walls)

  • You can apply Umaku Nureru (For Finish Coat) to a Japanese-style wall directly, even if the surface is quite flaky, as long as no part of the surface is detached or peeling off. The plaster will still achieve a lovely finish. You can also apply the plaster directly to a diatomite surface. Follow the steps below in both cases.

  • Clean the surface and prepare the area for the plastering work

    Remove any dust and dirt from the wall. If there is any mold on the wall, we recommend that you remove it using a commercially available mold remover. Do not forget to apply tape, corona maskers, etc. to ensure clean work.

  • Apply the first coat (Umaku Nureru For Finish Coat)

    Apply a thin coat of Umaku Nureru (For Finish Coat) directly to the Japanese-style wall with a scraping motion. If the wall is not adhering firmly to the foundation, it may start to peel. If this happens, remove the entire wall and plaster the foundation.

  • Apply the second coat (Umaku Nureru For Finish Coat)

    Leave the surface for 1 to 2 hours after the first coat, until it is half-dry, with its color growing lighter gradually. When the surface is half-dry, the material will not adhere to your fingers even if you touch it. Start recoating the surface now. Apply a thin coat of Umaku Nureru (For Finish Coat) to the entire surface again, and you’re done.

*In some cases, plaster scum or stains will appear after the first coat. If this happens, recoat the surface on the following day or later, and the scum or stains will disappear.
*Depending on the original surface, the plaster may show fine hairline cracks after the first coat. If this happens, recoat the surface on the following day or later, and the cracks will disappear.
*If the pillars around the surface to be plastered are made of solid cedar, be very careful to cover them up and protect them to ensure that no Umaku Nureru touches them. If it does, it may cause black spots on the pillars.

4. Gypsum boards

  • You can also apply Umaku Nureru (For Finish Coat) directly to gypsum boards (or “gypsum plaster boards” to be exact). Confirm in advance that the gypsum boards are solidly fixed in place with screws arranged at approx. 150mm intervals vertically. If the boards are not fixed properly, the plaster is likely to crack at the joints between the boards. The steps to use in plastering these boards are as follows.

  • Apply Umaku Nureru Tape to the joints between the boards

    Umaku Nureru Tape is a special tape for use on joints between gypsum or plywood boards. It prevents cracking of the plaster at the joints. Apply this tape to all the joints between the boards (including corners).

  • Apply Umaku Nureru (For Finish Coat) to the joints

    After applying the tape, fill the V-shaped grooves of the joints between the boards with Umaku Nureru (For Finish Coat) using your hands or fingers (wearing rubber gloves). Leave the plaster for approx. 12 hours, and gently apply a thin coat of Umaku Nureru (For Finish Coat), just widely enough to hide the tapes, and the joints are finished. Remove any extra material to make the surface as flat and smooth as possible.

  • Apply Umaku Nureru (For Finish Coat) to screw heads

    Hide the heads of the screws fixing the boards by applying a thin coat of Umaku Nureru (For Finish Coat) to them.

  • Apply the first coat (Umaku Nureru For Finish Coat)

    On the day after plastering the joints or later, apply a thin coat of Umaku Nureru (For Finish Coat) to the gypsum boards with a scraping motion. Apply it thinly enough that the gypsum boards can be seen through the plaster.

  • Apply the second coat (Umaku Nureru For Finish Coat)

    Leave the surface for 1 to 2 hours after the first coat, until it is half-dry, with its color growing lighter gradually. When the surface is half-dry, the material will not adhere to your fingers even if you touch it. Start recoating the surface now. Apply a thin coat of Umaku Nureru (For Finish Coat) to the entire surface again, and you’re done.

5. Plywood boards

You need to use Umaku Nureru (For Undercoat) when plastering plywood or decorated plywood boards. Apply a thin coat of Umaku Nureru (For Undercoat) to the boards, and on the following day or later, apply Umaku Nureru (For Finish Coat) to finish the wall. As in the case of gypsum boards, you need to confirm in advance that the plywood boards are solidly fixed in place with screws arranged at approx. 150mm intervals vertically. The steps for plastering these boards are as follows.

  • Apply Umaku Nureru Tape to the joints between the boards

    Umaku Nureru Tape is a special tape for use on joints between gypsum or plywood boards. It prevents cracking of the plaster at the joints. Apply this tape to all the joints between the boards (including corners).

  • Apply Umaku Nureru (For Undercoat) to the heads of the screws

    Hide the heads of the screws fixing the boards in place by applying a thin coat of Umaku Nureru (For Undercoat) to them.

  • Apply Umaku Nureru (For Undercoat)

    Wait for 1 to 2 hours after step (2), and apply Umaku Nureru (For Undercoat) to the entire surface, thinly enough that the boards can be seen through the plaster.

  • Finish the surface with Umaku Nureru (For Finish Coat)

    On the day after applying the undercoat or later, apply a thin coat of Umaku Nureru (For Finish Coat) to the entire surface. Leave the surface for 1 to 2 hours after the first coat, and then recoat it thinly with Umaku Nureru (For Finish Coat). You’re done.

*Reddish brown plaster scum may appear after the undercoat. Just follow the steps above, and the scum will disappear.

6. A concrete/ concrete block/ mortar/ painted/ interior tiled surface

You need to use Umaku Nureru (For Undercoat) when plastering one of these surfaces also. Umaku Nureru (For Undercoat) is far more adhesive and durable than Umaku Nureru (For Finish Coat). It is therefore effective when plastering an exterior wall or a surface to which plaster does not adhere easily. The steps for plastering these surfaces are as follows.

  • Clean the surface and prepare the area for the plastering work

    Remove any dust and dirt. If you are plastering an exterior wall, we recommend that you wash the surface with water. Exterior concrete blocks may have mold or algae on them. Remove as much of this as possible by washing the block with water and using a scrubbing brush. Do not forget to apply tape, corona maskers, ground sheets, etc. to prepare for plastering.

  • Apply Umaku Nureru (For Undercoat)

    Apply Umaku Nureru (For Undercoat) to the entire surface, thinly enough that the original surface can be seen through the plaster.

  • Finish the surface with Umaku Nureru (For Finish Coat)

    On the day after applying the undercoat or later, apply a thin coat of Umaku Nureru (For Finish Coat) to the entire surface. Leave the surface for 1 to 2 hours after the first coat, and then recoat it thinly with Umaku Nureru (For Finish Coat). You’re done.

  1. 1.
    About
    Our Products
  2. 2.
    Preparations
    for Work
  3. 3.
    Key Points
    for Applying Plaster
    Like a Pro
  4. 4.
    How to Apply
    Plaster to
    Different Surfaces
  5. 5.
    Precautions

5. Precautions

1. Colors

  • Plaster colors other than white, black, and bengala become lighter when the plaster dries.

  • Because shikkui is a natural material, the finished colors may vary slightly depending on how you apply it, weather conditions, and the surface to which it is applied. The color of the plaster will be uneven if you apply the material to different types of surface or if you apply it later to areas that were uncoated in your original plastering job. We therefore recommend that you finish coating the entire surface at the same time if at all possible. If you recoat part of a plastered surface that has dried completely, the color of the recoated section will differ from the color of the rest of the surface even if you use a plaster of the same color. Accordingly, we recommend that you recoat the entire surface at the same time if at all possible.

  • Although we manufacture our products with the greatest possible care, because they are made from natural materials, their color and viscosity may differ slightly between production lots.

2. Plastering work

  • In the case of indoor work, do not use Umaku Nureru when the room temperature is 5 degrees Celsius or lower. In the case of outdoor work, do not use the product when the outdoor temperature is 5 degrees Celsius or lower.

  • Try to keep the room well-ventilated during plastering work by leaving doors and windows open. Use an electric fan if it is too cold to leave the doors and windows open. This will allow the surface to dry quickly and achieve a clean finish.
    *Please note that we cannot accept any responsibility whatsoever for uneven coats or any other defects caused by improper use of the product.

3. Handling of the product

  • Umaku Nureru is alkaline. Wear rubber gloves, protective glasses, and other protective gear to prevent damage to your skin and contact with your eyes.

  • If the product comes into contact with your eyes, wash your eyes with water immediately and seek medical attention.

  • Store the product in a place where it will not freeze. Keep it out of reach of children. Prevent accidental ingestion.

  • Wash plastering tools (such as trowels and palette) with water after use.

  • Drying time is approx. 24 hours from April to November (when the coating thickness is 3mm or less). The product takes longer to dry when applied to vinyl wallpaper.

4. Using Umaku Nureru outdoors

  • Umaku Nureru can be used for outer walls, kitchens, bathrooms, and other rooms in which water is used frequently. Protect a freshly plastered exterior wall from rain for about one week.

  • Use of a plaster color other than white for exteriors may cause the plaster to be chalky. This phenomenon is called efflorescence. White or a light color is recommended for exteriors. Do not use the product for exterior walls other than walls that are protected by roofs. We do not recommend use of the product for fence walls other than ones with caps (mizukiri kasagi) on top.

  • Do not use the product during cold seasons.

5. Cracks

  • Cracks occur in Umaku Nureru only in extremely rare cases. Causes of cracks may include movement of the original surface that was plastered, the use of an excessively thick coating, or use of the product in ways differing from those specified in the user instructions.