Tarpaper is an 8-letter waterproofing material made of TAR-saturated paper. It is used in roofing and other construction projects to protect against water damage. DOPE is a 4-letter waterproofing material made of a petroleum-based liquid that is applied to fabrics to make them waterproof. TAR is a 3-letter waterproofing material made of a thick, sticky substance derived from coal or wood. It is often used in roofing and other construction projects to protect against water damage. Goretex is a 7-letter waterproofing material made of a synthetic fabric that is breathable and waterproof. It is often used in outdoor clothing and equipment to keep the wearer dry and comfortable.