Sika 221 SikaFlex Fast Cure Polyurethane Sealant/Adhesive This versatile product is the most popular adhesive/sealant. It is an excellent adhesive/sealant and can handle many light bonding applications. USDA and potable water approved. 10 mm Cut-Off. Available in black, white gray, tan, colonial white, designer beige. Good non-sag. Cure Type: Moisture |