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    1. #4
      Join Date
      May 2013
      Posts
      42
      Country Flag: United States
      I've used zinc and copper based weld through primer. I've had better luck with the copper as far as ease of welding. In either case, you can tell you are not welding to bare metal. Remember it's still important to seam seal even with weld through primer. Here is what i use.



      https://www.amazon.com/SEM-40783-Copperweld-Weld-Thru-Primer/dp/B003TQGT4S





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