Trimmable, sandable and paintable Great Stuff expanding polyurethane foam sealant insulates gaps between stone, rock, wood, metal, masonry, glass and most plastics and repels water, insects, airflow and, in some cases, fire, smoke and toxic gasses. There is also a gun that attaches to Great Stuff cans to provide precise control for application and a cleaner that dissolves and removes uncured foam from the gun after use.