This is a TRE4353 Weld Thru Primer is a ready to use primer to aid in MIG/TIG welding. Weld through primer offers high resistance to salt & water, providing excellent corrosion protection to the weld area is quick drying & water-resistant after 15 minutes. It is formulated to be VOC compliant in California. It provides superior conductivity for welding applications & has minimal splatter during welding.