FROTH-PAK Foam Sealant is a 2-component, quick-cure polyurethane foam that fills cavities, penetrations, cracks and expansion joints. FROTH-PAK Foam Sealant can also be used as a sealant and void fill in many roofing applications. FROTH-PAK is chemically cured foam, which significantly reduces curing time. FROTH-PAK dispenses, expands and becomes tack-free in seconds. It skins over in 30-40 seconds and completely cures in minutes, depending on temperature.