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Exterior Foam Coat (3 lbs)

In stock
Brand New! Rock hard finish for all of your outdoor (and indoor) foam projects.
This stuff is super tough. It is not sandable. Has a rough stone feel when dry. It can be troweled smooth, or brushed to make a super rough finish.

Adheres to polystyrene foams.

Forms a weather resistant surface.

Easy to mix. Just add water.

Covers Up to 300 square feet.

Use above or below grade

Apply with paintbrush or trowel.



Many decorative surface textures can be created.

Soap and water clean-up.

Try adding Boost fortifier. (will not work with Bounce)


MIXING: Settling may occur in shipping causing a gritty texture that does not stick well. Remix if there is separation in dry mixture. Use when temperatures are between 40°F (4°C) and 100°F (38°C). Mix in a clean container with clean water. Add about 3 parts powder to 1 part water and mix until Foam Coat turns to a smooth paste. A drier mix is stronger. Do not overmix.

APPLYING: If using extruded foam (ie Blueboard or Pinkboard) roughen surface with coarse sandpaper. Fill big cracks and holes by applying pasty mixture with a trowel. You may add more water until mixture is thin enough to apply with a paint brush, although thinning weakens coating. Can be applied with a standard spray hopper. Use thinned mixture to texture large areas. For best strength apply at least 1/4" (6mm) thick. Multiple coats may be applied. Try texturing surface before coating sets.

SET TIME: Use within 30 minutes. Sets up in 1-3 hours. Fogging the surface for 24 hours will increase strength.

FINISHING: Remove dust before painting. This product goes on rough and is not sandable. Finish as the surface is setting up.

CLEAN-UP: Clean tools and brushes with clean soapy water before coating hardens.

WARNING: Avoid prolonged contact with skin. Wear dust, skin and eye protection. Use approved respirator when sanding. In case of eye contact, flush immediately with water, consult a physician. Wash hands with soap and water after use and before eating. Keep out of reach of children.


1/64” thick 36 sq ft

1/16” thick 9 sq ft

1/4" thick 2.25 sq ft


Flammability: Noncombustible and not explosive

Auto-ignition Temperature: Not Applicable

Flash Points: Not Applicable

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