Choose an effective, moisture resistant sealant with Touch 'n Foam 2-Component Spray Foam. It expands and cures quickly to fill cavities, gaps, cracks, expansion joints and other sources of air leakage in a building envelope. Resists moisture that can lead to mold or mildew. It also provides increased sound and thermal insulation. Will not shrink, compress, settle or biodegrade like fiberglass or cellulose insulation. Bonds to a variety of materials, including wood, masonry, metal and drywall.