CAM WELD THROUGH PRIMER is a unique Zinc rich coating that provides maximum rust and corrosion protection in welded areas. Because CAMWELD is a metallic coating its ability to conduct electric current makes it an ideal coating between metal that is being spot welded together. This prevents rust and corrosion from developing in such areas as high strength steel structural members found in today's unibody cars. The protective properties of CAMWELD allows it to be used under most paints, lacquers, vinyls, and rubberised coatings to restore OEM corrosion protection requirements in wheel wells, under vinyl roofs and battery box areas.