Terostat 8517 H Glass Metal Primer is a black, highly liquid primer based on polyurethane. It contains solvent. Terostat 8517 H improves adhesion of polyurethane adhesive/sealants on glass, glass ceramics, metals, and plastics (trials recommended). Itis outstanding for its good covering capacity and its excellent UV stability. It does not contain chlorinated hydrocarbons or aromatics.