Sherwin-Williams Sprayon® WL740 Zinc Rich Galvanizing Compound: This high-performance aerosol primer contains 97% pure zinc dust and is specifically described as an "outstanding weld thru primer". It stops rust by electro-chemical action and is suitable for use on welded joints in severe corrosive environments such as bridges, structural steel, and marine applications

KEY FEATURES

• 97% pure zinc dust
• Stops rust
• Low VOC
• Non-sagging formula
• Weld Through Zinc Galv Spray 

USES

• For use in automotive, marine, nuclear facilities, power plants and refineries.
• To be used on industrial tanks, piping, welded joints, bridges, farm equipment, fences, wrought iron, gutters, structural steel, transmission towers, and galvanized surfaces.