Expanding Foam. A ready-to-use, multi-purpose, polyurethane foam that is triple expanding when in contact with air. The expanding action fills holes, cracks and gaps more completely than standard caulks. It has excellent insulating properties and superb adhesion to virtually all building materials. Tack free in 10 minutes. Fully cured in 12 hours. Paintable with a R Value 4.7. Not a fire stop. No CFC or HCFC.