FloraCraft Great Stuff Expanding Floral Foam Filler, 12oz. This foam expands to 200% it's size to fill in gaps and cracks, forming a long lasting airtight and water resistant bond to most floral materials. Can be trimmed, sanded, and painted. Foam is tack free in 15 minutes and completely cures in 8 hours. This is a great product to use to fill any floral container to hold stems and picks in place securely. Or use to create fake bakes, icing and other creations! Restartable for up to four weeks, but restart is not guaranteed.