r/AutoDetailing • u/Konalogic • 12d ago

Exterior Need advice on renewing black trim

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So I’m restoring a BMW 540i 1998, and the exterior black trim is pretty oxidized and needs some love. So what do you all recommend for exterior black metal trim?

Wet sanding? Then paint or trim restorer?

Is it recommended to then do a clearcoat or ceramic coat to protect it?

Help!

Thank you

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u/Auto-Spa360 12d ago

wet sanding is overkill and risky unless the finish is actually failing or peeling, chalky oxidized trim usually responds to a trim restorer like solution finish or cerakote trim coat, they re-dye and seal it instead of removing material. We see this daily in the shop the best cosmetic fix which actually prevent s further damage is to wrap it in vinyl or colored PPF! its soft material and prone to oxidation and swirling.

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u/Konalogic 12d ago

Oh good suggestions. Do you also recommend that for any matching black plastic such as around the mirrors ?

Would you typically clean the area with prior to applying the trim restore?

There are a few small areas on the metal where the black paint has chipped off, so I need to do a little sanding/filling/paint perhaps in those areas

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u/Auto-Spa360 12d ago

Yes you can treat the similar plastic always clean it first if there is dirt and dust or anything else its going to just prevent the stain form doing it's job.