CRL One Step POWR Bond Primer is used before applying CRL Somaca Series Urethanes. Its formula reacts with the glass frit and urethane to provide a very secure bond. Make sure that the glass surface is thoroughly clean by applying PWR22 Automotive POWR Glass Cleaner and then apply One Step POWR Bond Primer to the frit with a lint-free wipe, preferably CRL BX15 Lint Free Glass Wipes. Apply One Step POWR Bond Primer to bare surfaced pinchweld metal scratches or rust areas that have been properly prepared or repaired prior to appling this primer. This product may also be used on glass without black ceramic frit to improve adhesion.