The easiest and most effective way to protect engine blocks, nuts & bolts, trim and tilt rams, trailers and other metal surfaces from corrosion. Will not harm painted surfaces or wiring. PTEF^® polymers bond to metal surfaces for a long lasting barrier against damaging salt and moisture. PTEF® polymers bond to treated surfaces to help repel moisture, dirt, grime and more. Just spray directly to surface and allow to dry. Size: 22 oz.