Hot Wire Foam Factory Exterior Foam Coat, 25 lbs.

Item #: 87645
Our Price $34.95
Our Price $34.95

Manufacturer’s estimate time of arrival: Due to the Coronavirus this item will be delayed in shipping until the end of April. You may still place your order for backorder. Your credit card will not be charged until your item ships. Reserve yours today!

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.
  • Use above or below grade.
  • Apply with paintbrush or trowel.
  • Paintable.
  • Fireproof.
  • Many decorative surface textures can be created.
  • Soap and water clean-up.
  • Add Boost fortifier if extra strength is desired. (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 square feet

1/16" thick, 9 square feet

1/4" thick, 2.25 square feet

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