Weld-Thru Primer Copperweld - Sem Products

Please note: SEM Products Model 40783 Weld-Thru Primer Copperweld has been discontinued by the manufacturer as of June 2018 and has been superseded by Model 40793. This product description pertains to the features and applications of the original 40783 model.

Sem Products 40783 Weld-Thru Primer Copperweld

SEM Products 40783 Weld-Thru Primer Copperweld is a professional-grade, zinc and copper-enriched coating engineered for demanding collision repair, structural fabrication, and restoration tasks. This aerosol primer delivers reliable, long-term corrosion protection to steel panels, particularly in overlapping sections, while ensuring optimal conductivity for various welding processes. It supports efficient shop workflow by facilitating strong, clean welds without compromising the integrity of hidden joints.

Key Features

• Enhanced Corrosion Protection: Delivers robust rust prevention in critical overlap areas, hidden flanges, seams, and rocker sections where moisture often accumulates, thereby extending the lifespan of repairs.
• Stable Weld Performance: Its conductive, copper-enriched formula promotes a stable arc, leading to cleaner and stronger spot and MIG welds with reduced post-weld cleanup.
• Minimized Heat Distortion: Helps manage heat-affected zones on thin automotive sheet metal, mitigating panel warping and spatter during welding operations.
• Process Compatibility: Formulated for reliable use with spot and MIG welding processes; compatible with TIG applications when the weld path is cleaned while adjacent coated areas remain protected.
• Strong Adhesion: Ensures a secure bond to properly prepared bare steel, maintaining coating integrity through clamping, test-fitting, and welding stages.
• Efficient Application: The fast-drying aerosol delivery offers a uniform spray pattern and quick flash time, optimizing throughput in busy professional environments.

Applications

This weld-thru primer is suitable for professional automotive body and frame repair on both domestic and import steel panels, including rocker panels, quarter panels, door skins, rails, and core supports. It is also an effective solution for classic vehicle restoration, offering lasting internal protection for boxed sections and joints. Additionally, it can be utilized in general metal fabrication and industrial assemblies requiring weldable corrosion protection within seams and overlaps that become inaccessible or sealed after assembly.

Specifications

• Manufacturer: Sem Products
• Model Number: 40783
• Product Name: Weld-Thru Primer Copperweld
• Container: 20 oz aerosol can
• Approximate Weight: 1.5 lb