Gaps and Cracks High-Density Foam is a versatile polyurethane foam designed to seal and insulate gaps up to 1 in. wide. The high-strength formula helps provide long-lasting durability while supporting energy efficiency and temperature control in properly prepared areas. It can be sprayed or plugged and cleans up with water within 5 minutes of application. The foam can be stored for up to three weeks when sealed properly, making it convenient for multiple uses. The product includes two straws for precise application, and is ideal for use in attics, Hvac systems, ducts, pipes, vents, foundations, and more.