High-quality expanding urethane foam designed to fill large areas quickly and permanently. Uses include filling holes, cracks, or gaps that require a complete airtight and waterproof seal but are too large to be filled with ordinary caulk. The foam expands approximately 3 times its original volume, is tack-free in approximately 45 minutes, and fully cured in 12 hours. Dispensing apparatus included with each can. UL classified. No CFC's.