RED SIL RTV silicone is an excellent adhesive, sealant and caulk. It is ideally suited wherever a strong, permanently flexible weatherproof caulk, adhesive or sealant is needed. Excellent as an adhesive for bonding plastic and metal. Works well in high humidity, is mildew resistant, and won’t fade or discolor with aging. When fully cured RED SIL will form an extremely tough, rubbery solid like material.