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Weld-through primers are generally a zinc-based product that are applied to the mating surfaces prior to welding. Corroding zinc forms zinc oxide which protects the steel. This is called sacrificial corrosion. For a quality weld to be made it’s required that the weld-through primer be removed from the direct weld zone before welding the joint when GMA welding. Many OEMs have a position on when and how to use weld-through primer or when it shouldn’t be utilized. Let’s see what we have found for weld-through primer guidelines.
After writing this series of articles, we found that the majority of OEMs require the use of weld-through when replacing steel weld-on parts. Some OEMs have a specific brand of weld-through primer that they require. We also located where this information can be found in the body repair manuals. It is important to note that weld-through primer should not be used on aluminum.
Use the vehicle-specific body repair manuals to determine which type of welding is required for the repair you are performing. Failure to follow OEM procedures will sacrifice the safety and quality of the repair.
To view each article in the Weld-Through Primer Guidelines series follow the links below.
Weld-Through Primer Guidelines: Audi
Weld-Through Primer Guidelines: BMW/Mini
Weld-Through Primer Guidelines: FCA/Stellantis - UPDATE
Weld-Through Primer Guidelines: Ford/Lincoln
Weld-Through Primer Guidelines: General Motors - UPDATE
Weld-Through Primer Guidelines: Genesis
Weld-Through Primer Guidelines: Honda/Acura
Weld-Through Primer Guidelines: INFINITI
Weld-Through Primer Guidelines: Jaguar Land Rover
Weld-Through Primer Guidelines: Kia
Weld-Through Primer Guidelines: Maserati
Weld-Through Primer Guidelines: Mazda
Weld-Through Primer Guidelines: Mercedes-Benz
Weld-Through Primer Guidelines: Mitsubishi - UPDATE
Weld-Through Primer Guidelines: Nissan
Weld-Through Primer Guidelines: Porsche
Weld-Through Primer Guidelines: Rolls-Royce
Weld-Through Primer Guidelines: Subaru - UPDATE
Weld-Through Primer Guidelines: Tesla - UPDATE
Weld-Through Primer Guidelines: Toyota/Lexus/Scion
Weld-Through Primer Guidelines: Volkswagen
Weld-Through Primer Guidelines: Volvo
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Article validated in 2022