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Rust proofing the back side of a auto sheetmetal weld

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  • Rust proofing the back side of a auto sheetmetal weld

    Any one know how to rust treat the back of a sheet metal patch before welding it into place. I'm not sure if it can be done because of heat and cleanliness.

  • #2
    Clean as best you can & use weld through primer. Weld in patch & then drill an access hole so you can get a nozzle inside & use whatever paint or product you are comfortable with. Then pop a rubber plug in & call it day.

    Eastwood sells some products for just this purpose. One good one is called rust encapsulator.

    http://www.eastwood.com/paints/rust-...Brand-Eastwood
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    • #3
      That's my best advice yet. Thanks

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      • #4
        Originally posted by billytylerjr View Post
        Any one know how to rust treat the back of a sheet metal patch before welding it into place. I'm not sure if it can be done because of heat and cleanliness.
        I don't know if it's still available. We used a product from Texaco; rustproofing grease. The stuff lasts at least 40 years, it's still sticky if you squeeze through the crust.
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        • #5
          Rust proofing the back side of a auto sheetmetal weld

          Cosmoline is used by the military to coat weapons. Royal pain to get off. Will last longer than any of us will live.
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