Titebond WeatherMaster Gutter & Seam Sealant provides a highly weather-resistant seal against water, wind, dust and dirt. This long-lasting advanced polymer sealant retains resiliency and flexibility for years. Gutter & Seam Sealant was formulated specifically for sealing aluminum, galvanized and vinyl clad gutters and downspouts. This sealant has excellent adhesion to wood, metal, aluminum, steel, plastics, masonry and glass. It expands and contracts with the change of weather and will not crack.