2320 Gutter and Narrow Hem Sealant is a single-component, elastomeric, semi-self-leveling tripolymer high-performance sealant, designed to prevent the passage of air and moisture through small joints or seams. Excellent adhesion to many construction surfaces, even when wet or greasy. Exceptional ultraviolet resistance. You can paint. semi-self-leveling. It cleans up easily. COMPATIBLE asphalt shingles. Asphalt asphalt, brick (masonry), concrete, glass, vinyl, wood, sheet metal, and other common construction substrates. Not recommended for joints larger than 1/4" x 1/4". Do not use on traffic-bearing surfaces. Do not use in contact with extruded polystyrene. Not suitable for potable water applications