Froth-Pak™ Spray Foam Sealant is a two-component, quick-cure polyurethane foam that fills cavities, penetrations and cracks in rim joists, roof wall junctures and around pipes and ducts etc. greater than 2" and less than 4" wide. Froth-Pak™ Sealant is a chemically cured foam designed to significantly reduce curing time. It dispenses, expands and becomes tack-free in seconds.