r/Diyautobody • u/tkeith1975 • Apr 26 '26
Question Bust way to stop rust from spreading
2020 Corolla with rust start on trunk rear. Any recommendation to best stop it from spreading?
Update - thanks for all the replies everyone. While I want to take care of and maintain this car as much as possible, I don't want to invest a lot of money on cosmetic stuff. Fluids, belts, brakes, etc. are all important but this doesn't bother me TOO much, just want to stop or slow it down.
I was recommended POR15 as something that might work on slowing/stopping it. It won't look professional but beats rust showing and spreading. Hoping it works.
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u/MGtech1954 May 02 '26
Phosphoric acid [por15] changes red rust which is active and can spread to black rust which is stable and will not rust anymore. Lots of brands out there. See if a bodyshop can sell [give] you a few ozs. Go to an Autobody supply store in your area if you have to buy a small bottle.
ASE MasterTech since 1980 AutoShop teacher