White Sealant 16Lb Cylinder can be used when high expansion is needed to fill and seal larger gaps and cracks. The 16lb canister yields 24,000 linear feet of ¼” bead. This foam sealant is high performance, single component, moisture curing, Class 1 fire retardant, expanding polyurethane sealants. Use White Sealant to permanently air seal and insulate gaps and cracks to block drafts, moisture and insects while improving comfort and reducing energy usage in commercial, industrial, agricultural and residential applications. Common applications include sealing around plumbing, ventilation outlets, electrical junctions, between sill plates and concrete slabs, or anywhere requiring a fast, economical air-sealing moisture barrier.