All purpose foam coat. This rock-hard cement-like coating protects and beautifies your foam projects. Comes in a dry powder - simply mix with water. It's tough but still sand-able. It is inherently fire resistant. Can be used outdoors when sealed with any outdoor paint, or mixed with Boost liquid fortifier, or Bounce liquid rubberizer. Apply thick with a trowel or thin with a paintbrush. Sets up in only about 15 minutes. Extend the drying time by adding up to 50% latex paint with your water before mixing into the dry foam coat. 3 lbs covers up to 30 square feet.