Repair Plaster Walls!

Repair plaster or damaged walls.  Nu-Wal® is a quick and efficient system for repairing damaged plaster substrates of walls and ceilings.  The Nu-Wal® system covers and reinforces the entire surface with a fine textured fiberglass mat embedded in an elastomeric adhesive.

The non-woven fiberglass mat and the acrylic binder create a surface that resists impacts and abrasions.

Cracks in exterior or interior surfaces do not come back as they do with patching compounds.

Repairing plaster with Nu-Wal® conforms to all the requirements of ASTM E-1795 and ASTM E-1797 of liquid coatings for leaded paint in buildings.  Although extremely durable (35+ year old applications show no defects), Nu-Wal® is applied as simply as wallpaper.  Restoration is quick, affordable and long-lasting when you repair plaster walls with Nu-Wal.

Restored surfaces are ideal for either painting or wallpapering.  No mixing is required and clean-up is with water.

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Nu-Wal® Benefits

While Nu-Wal repairs cracks and holes it is also strengthening and stabilizing your walls and ceilings.  It produces a smooth consistent surface over entire surface.

Application is an easy economical and quick renovation.  There are no heavy sheets to handle, no toxic fumes, no need to reset electrical or remove wood casing and base and is easy water cleanup.

Application on exterior wall, above and below grade line, will not only restore but will also waterproof.

Energy Saving

The combination of reduction of air infiltration and addition of vapor barrier is applicable to both new construction and restoration.

Wall Surface

After application of the NU-WAL® Restoration System you will have a smooth surface similar to that produced by latex paint.

If your wall has bumps or ridges, these areas need to first be leveled out or the imperfections will telegraph through.

Surface Burning

The Nu-Wal® system is classified as Class A surface burning, as prescribed by      ASTM-E-84.

Vapor Barrier

The NU-WAL® renovation system was tested as prescribed by ASTM and does meet the requirement to be a vapor barrier.  This vapor barrier is where it should be, on the inside surface of the warm side of the wall or ceiling.

System Uses:  How to Repair Plaster Walls

Restoring cracked plaster walls and ceilings is the main purpose of the NU-WAL® system; however, many other residential and commercial applications are proved installations.

Where To Use

The primary use for Nu-Wal® is on interior plaster walls and ceilings of homes and commercial buildings where the plaster has cracked.

  • Lead paint encapsulation (ASTM 1795 -1797)
  • Churches
  • Schools
  • Hotels, Motels, Bed and Breakfasts
  • Nursing Homes
  • Food Processing Plants
  • Interior and Exterior wood casing and window sills
  • Exterior wood flush veneer doors
  • Exterior wood fascia
  • Over drywall (Sheetrock® )
  • Wood Paneling (See application and instructions)
  • Industrial Clean Rooms (labs)

Estimating Guide


#2500 Nu-Wal® Coating & WC-14 Fiberglass Mat

Apply both adhering and saturating coats of #2500 Coating at the rate of 160 square feet per gallon.  This yields a total of 80 square feet per gallon for the system coverage.  When calculating the number of square feet of WC-14 Fiberglass Mat needed for wall application, it is advisable to not deduct the area of the doors and windows.  Fewer seams are possible this way.

1 – 6 Gallon #2500 Nu-Wal® Coating +
1 Roll 48″ x 120′ WC-14 Fiberglass = 480 sq. ft.

1 – 2 Gallon #2500 Nu-Wal® Coating +
1 Roll 48″ x 40′ Nu-Wal® Coating = 160 sq. ft.


Leaded Paint Encapsulation


NU-WAL® #2500 Coating conforms to all of the requirements in ASTM  E-1795, Standard Specification for Non-Reinforced Liquid Coatings Encapsulation Products for Leaded Paint in Buildings, Type 1, Interior Use.

The NU-WAL® #2500/WC-14 Fiberglass Mat Restoration System conforms to all of the requirements in ASTM E-1797, Standard Specification for Reinforced Liquid Coatings Encapsulation Products for Leaded Paint in Buildings, Type 1, Interior Use.

The NU-WAL® #2500/POL-E-CAP Trim Reinforcing System conform to all of the requirements in ASTM E-1797, Standard Specifications for Reinforced Liquid Coatings Encapsulation Products for Leaded Paint in Buildings, Type 1, Interior Use.


Basic Application Procedures on how to repair plaster wall.


Wall Preparation

  1. Remove all loose particles from the surface.  The areas to be covered must be free from oil, dirt, dust, mildew or other contaminates.
  2. If the plaster has shifted as a result of a crack, sand the ridge to an even plane.  It is not necessary to fill cracks that are one sixteenth of an inch or less.  The #2500 Coating will fill and adhere the plaster.  Larger cracks at inside corners may be filled with more than one coat of the #2500. (Drywall compound does not expand and contract).
  3. Repair large holes with patching plaster or drywall compound. It is not necessary to “key” larger cracks.
  4. Spot prime all bare plaster and patching areas.  A painted or sealed surface is required so the #2500 Coating is not excessively absorbed in the substrate.
  5. If the walls or ceilings to be restored are chalky they must be sealed with a penetrating surface conditioner (see picture to right).

Wall Paneling and Grooves

To restore walls and ceiling it is recommended to remove wall paneling to expose the plaster surface and prepare it the same as “Plaster” instructions.

If this is not practical, you can cover the paneling with Nu-Wal® after filling in the wall paneling grooves with patching compound.  Fill and sand the coats to keep the grooves from showing through.  Note: The surface must be smooth and flat.  Next prime the entire surface with a penetrating primer and apply the Nu-Wal® System after the primer has cured.


To properly apply Nu-Wal® it is necessary to remove wallpaper.

Areas where the wallpaper is impossible to remove should be leveled out and primed.  The #2500 Coating will not penetrate the wallpaper to adhere to the plaster underneath.

Gloss Enamel on Walls & Ceilings

If the gloss surface is in a bathroom or kitchen wash the walls to remove all soap or cooking oil.  If you do not have a lot of bare plaster as a result of patching you can eliminate the gloss with a fine sandpaper.  If you have patches to seal it may be easier to prime the entire surface before applying the Nu-Wal®.

Rough Texture

Acoustical texture on ceilings can be removed with a 4″ flexible putty knife and primed with a saturating primer before applying Nu-Wal®.  Walls with heavy texture (swirl or Spanish stucco) must be sanded to a smoother surface.  Sand finish textures will require more #2500 Coating than normal.  Best results are by applying a coat of #2500 coating (with a short nap roller) to the entire surface and allow it to dry before applying the Nu-Wal® system.  The reason you use #2500 instead of primer is the fact that the #2500 leaves a heavier film on the surface.

Voices of Experience

Inside and Outside Corners

Plaster is hand toweled when it is applied.  This makes it difficult to have perfectly straight lines at both inside and outside corners.  When starting or ending at either an inside or outside corner it is necessary to “wrap around” inside corners (about 1 inch) and cut the fiberglass at the center of the turn.  Remove the 1″ fiberglass and coat with #2500. This procedure also eliminates the need to have the fiberglass perfectly plumb.  Outside corners are also cut in a similar way.

One Wall at a Time

When you start a wall at either corner, do not stop the application until you have completed the entire surface to the next corner.  Do not spend too much time on each four foot width of fiberglass or the #2500 Coating will dry and make it difficult to make a successful “double cut”.  “Nu-Wal®” is not intended to be a wall patching system.  If you do not cover the entire wall you will see the edge of the WC-14 Fiberglass and texture of the wall will not be consistent.

What if I Get a Wrinkle?

Start at the ceiling and embed the fiberglass to the wet #2500 Coating, beginning at the center of the 48″ width.  Proceed by using a dry nine inch paint roller to adhere the fabric – working down and out in both directions.  Do not use a wallpaper brush.  There may be humps and pockets in the wall surface that will be bridged by the wide width of the brush.  Paint rollers also exert more pressure on the fiberglass to embed it in the wet #2500 Coating.  If you do have a wrinkle, caused by the fiberglass twisting as you adhere it to the wall – immediately pull it out from the wall enough to roll out the problem.  If a wrinkle is small (usually caused by humps or pockets) slit the fiberglass with a single edge razor blade and roll smooth.

Double Cuts

The most successful result of “double cuts” is achieved with a single edge razor blade, held at a forty five degree angle.  Take care not to press too hard with the blade and score the plaster underneath.  As you continue to apply the second coat of #2500 over the fiberglass, do not put extra pressure on the paint roller when going over the seams.  This results in applying less #2500 Coating over that area.  Coat #2500 on the entire wall surface with a paint roller in a criss-cross pattern, including the seam area.

What if Seams Show

After the #2500 Coating is dry you may see some seam presence if the plaster was scored with the razor blade.  You should also inspect the slits you may have made to remedy wrinkles caused by humps or pockets. The procedure to eliminate this problem is to apply a very small amount of drywall compound (with a finger) to the slit area.  While still wet, remove as much as possible of the compound with a 4″ flexible putty knife.  This will leave only a line at the slit area without changing the texture of the surrounding fiberglass mat.  If you have any change in the texture you may apply #2500 Coating over this area with the same paint roller previously used.

Radiant Heating

Nu-Wal® has been successfully used on ceilings with radiant heating.  Maximum Service Temperature (150ºF Continuous) ASTM D-2485).

Ceiling Application

Basic application is the same as walls.  The difference is the application of the WC-14 Fiberglass Mat.  Start at the ceiling next to a wall of your choice.  From the center of the ceiling adjacent to the wall adhere the fiberglass in both directions toward the end walls.  As an option you may wish to cut the fiberglass and apply it in two pieces.  Adjustable “T” supports, made from light-weight tubing are useful tools.  Ceiling application is advisable to be applied by more than one person.


#2500 Coating

#2500 Coating is a liquid emulsion formulated to saturate and adhere WC-14 fiberglass mat to plaster, concrete, stucco and all common construction materials — interior or exterior.

Weight (lbs/square) 10.5 ASTM D-1475
Consistency (Stormer KU) 130 D-562
Viscosity (centipoises) 3000 Brookfield
Acidity/Alkalinity (pH) 7.0 ASTM E-70
Total Nonvolatile Solids by weight (%) 63.7 (actual) ASTM D-2369
Nonvolatile Latex Solids on Total Weight (%) 24.8 (calc.) ASTM D-2369
Total Solids by Volume (%) 53.4 (calc.) ASTM D-2369
Dry – Through Time on Metal (Hours @35-45% RH) 6 ASTM D-1640
Dry to Touch Time on Metal (Minutes @72-74ºF) 40 ASTM D-1005
Mandrell Flexibility, 1″ Rod @ 0ºF No cracking of 30-mil film ASTM D-1737
Elongation, Aged 30-mil film (%) 106 ASTM D-2370
Tensile Strength, Dry Film (psi) 237 ASTM D-2370
180º Peel Adhesion, aged films (lbs/in) 4.0 (bare wood)
3.9 (galvanized steel)
3.4 (glass)
FED spec (con-nbs)
Sect. 4.310
Service Temperature, Minimum (ºF, continuous) -15 ASTM D-2485
Service Temperature, Maximum (ºF, continuous) 150 ASTM D-2485
Service Temperature, Maximum (ºF, intermittent) 300 ASTM D-2485
Resistance to Gasoline and Mineral Spirits No change after 24 hr. ASTM D-543
Freeze/Thaw Stability
(# of satisfactory cycles)
5 ASTM D-2243
Resistance to
Hydrostatic Pressure
no failure @ 4psi, two coats on concrete block
Flam Spread, with WC-14 Fiberglass Mat (rating) 16.2
(Class A Max=25)
Smoke Developed 4.8 ASTM E-84

WC-14 Fiberglass Mat:

WC-14 Fiberglass Mat is a porous, non-woven mat composed of lime borosilicate glass fibers.  The fibers are reinforced with chopped strand fiberglass yarn and bound with an acrylic binder.  The unique random, jackstraw pattern of the glass strands makes WC-14 fiberglass mat strong yet flexible and provides resistance to the cracking and crazing of the underlying substrate.  The mat increases resistance to impacts and abrasion and is rigid enough to bridge cracks and holes when adhered with #2500 coating. WC-14 non-wicking fiberglass resists rot, decay and other effects of moisture better than reinforcements made of organic fibers.  When wet during application, the mat maintains its dimensional stability.  Lightweight and nonflammable, WC-14 is also more economical than the organic or polyester materials used in similar applications.


Weight (lbs/square) 1.15 FG 436-704
Thickness (mils) 18 FG 436-702
Tensile (lbs/3″ width)   M-D 40 FG 436-703
Tensile (lbs/3″ width) CM-D 30 FG 436-703

If  you have any questions on how to repair your plaster wall or ceiling or any type of damaged walls, call.  We’re here to help.