Description The Federal Process EF12 Expanding Foam 12 OZ Key Features Insulates and seals around ducts, pipes, air conditioning units, heating equipment vents and much more! Cured product can be trimmed, sanded and painted. Foam dries to the touch in 30 minutes and cures in 4 hours. Perfect for voids and resists mildew. UL Surface Burn Test: Flame Spread - 10, Smoke Development - 15, Burn Temperature - 240ºF