3M™ 05917 Weld-Through II Coating, 12.75 oz, Gray, 528 sq-ft Coverage3M Weld Thru II is a convenient aerosol coating designed to prevent corrosion between welded metal surfaces. Featuring a zinc base that draws corrosion away from bare metals, it helps prevent costly comebacks due to corrosion at welds. Spray coating applies fast, resists weld spatter common to some weldable primers and dries in as little as 5 min, increasing shop efficiency and productivity.