Organosilanes of the vinyl and methacrylate functional type have been examined as adhesion promoters for modified alkyd and acrylic paints. Torque shear and direct pull off adhesion test have shown that some improvements in initial bond strength to degreased aluminum and mild steel can be obtained when the silanes are used as pretreatments. The major improvements in bond strength are noted after exposure to high humidity or water immersion tests. See also AATA 26-703 for Part 2.