Rust proofing the back side of a auto sheetmetal weld

[billytylerjr]

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.

[MMW]

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-solutions.html?SRCCODE=MN200200&utm_source=msn&utm_medium=cpc&utm_term=%7Bkeyword%7D&utm_campaign=Brand-Eastwood

[billytylerjr]

That's my best advice yet. Thanks

[WillieB]

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.

[stickermigtigger]

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.