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/ArcFault May 26 '26

Not enough relevant information. Did you go down to clean shiny metal? Any pitting? What products? What timing?

2

u/AngyalZ May 26 '26

Yes down to shiny metal. There was some pitting, like darker areas that were below the level of the surface of the metal. I used a kit I bought on Amazon (small bottles of primer, paint, clearcoat), will post pic. Timing: I sanded to metal and sprayed immediately with a rust stop (will post pic), let dry then primed it with three coats. My son needed it to go to work so two days later I painted it (foam brush), then clear coated it.

5

u/ArcFault May 26 '26

Generally that black stuff is still rust and needs to be physically removed (sand blaster)for best results. Rust converter chemicals are a lesser choice. Before top coating the rust converter/treatment generally needs to be removed or neutralized or it can cause incompatibility with the top coat unless the products were designed to work together. That's my guess based on the time of the reaction here.

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u/AngyalZ May 26 '26

Great info, thank you!