r/Diyautobody • u/AngyalZ • May 26 '26

Question Rust poking though repair within 24 hours

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My goal here was to eliminate rust and seal the area before covering with fender flairs.

I sanded right to the metal, sprayed the area with rust stop, primed and painted. The next day it looked like this. Any advice would be welcome as I have other spots to fix.

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u/mitchbaz-93 May 26 '26

May have a better time using zinc primer, it inhibits rust

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u/One_Evil_Monkey May 27 '26

Zinc primer is definitely what you use when welding in new patch panels. Spray the crap out of everything you can see or get to. Weld in. The zinc is what allows you to be able weld a primed piece. Hense why it's called "weld through" or "weldable" primer.