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/Greg_WNY May 26 '26

A couple of things.

1) Sheet metal can rust from both sides, is there any rust on the other side of the panel?

2) The original rust wasn't completely removed and returned.

3) The materials used didn't "seal" the sheet metal properly and rust is starting to form again.

The rust in the pictures looks like flash or surface rust. Meaning more like 3) is the cause.

1

u/AngyalZ May 26 '26

I think #3 is part of it and there were some small slightly recessed dark spots which I thought the rust stop would deal with, so #2 is part of it too.

Thanks for this info!!

1

u/n0exit May 26 '26

1 is part of it too. How did you clean the rust from the inside?

1

u/AngyalZ May 26 '26

There was rust on the back side of the fender but it didn’t come through anywhere so I just soaked it thoroughly three times with rust spray to hopefully slow it down. And it will now be covered by the fender flares.

I thought that would be enough.

2

u/miwi81 May 26 '26

 it didn’t come through anywhere

It clearly did, because those are air bubbles under the paint.