Expand-A-Foam is a one part, multi-purpose filler for holes, joints, and cracks. Excellent for sealing and caulking during equipment installation and construction . Expand-A-Foam is tack-free in 20 minutes, and fully cured within 24 hours. As it expands to three times its exit size, fill only 35% of cavity to be filled. Great to use where regular caulking won’t work or is cost prohibitive. UL recognized, contains no CFC, 12 oz. can.