Superior adhesion to all types of SMC and fiberglass. SMC resin is a polyester-based resin used for repair of SMC and fiberglass panels and parts. More effective on SMC than conventional fiberglass-type resins. Formulated to use with fiberglass mat, cloth and tape. Waterproof and impact resistant. Cures to a sandable surface much faster than regular fiberglasss resin. White cream hardener included.