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I am in the process of helping a friend with his '54 3100. He has the truck completely torn apart and has sanded most of the old paint off. After sanding he coated everything with oil (not sure exactly what kind) to keep it from surface rusting. The fenders have had body work done by a PO and they do have bondo on them that is now visible since he sanded the paint off.

Even though the parts will be cleaned thoroughly before getting primed and painted, I am concerned that the oil has penetrated into the old bondo and it will cause major headaches.

Am I correct to worry? What should be done to correct this before it is time to paint?

bigbassmann,

I think worry is in order. As I recall, Bondo by nature is porous. I'm not sure how one would clean the oil off/out on a deal like this. Maybe some of the pre-paint degreaser...something that won't 'melt' the Bondo. Clean it and seal it with a epoxy primer.

Stuart

I agree with atomarc ,
The oil has prob soaked into the bondo , I am bettin on major fish eye problems even after cleanin it , The oil will want to bleed up an cause probs.

Ya wanna grind out that old Bondo, it is like a sponge & will never give up all the oil. Fisheyes & paint lifting. Oil is about the worst thing around paint(except maybe silicone). My $.02

that sounds like a dirty trick that a mean old body man might play on a fresh young painter with an attitude!

Thats a major nightmare in the making!!
The next step is to surface clean that crap off. You will need a heavy duty cleaner like PPG's dx440. Apply cleaner too rag(a clean rag) and wipe the surface. Continue wiping the surface clean til the rag shows no sign of oil/dirt. This will require many rags.
Then take a water bourne cleaner like PPG's dx103 and repeat the process.

Once the surface is spotless, remove the filler, then repeat the cleaning process. If you do NOT remove the oil first and just grind that mud away you will do nothing but grind that oil right into the metal. You do that you will have a BIG problem.
Clean the metal first then remove the mud then clean again.

You fail to do this you are asking for HUGE paint problems, fisheyes would be the least of it...Eric

Thanks for all the replies. You have confirmed what I thought all along. Not sure why my bud didn't just spray on some cheap rattle can primer to keep down the surface rust, would have been much easy to deal with when the time comes. Besides that, all the parts are kept in a storage shed so it isn't like they were outside where they would be getting wet.

When I first found out that he was putting this oil on the parts, I told him that it was a bad idea. Now we will have to spend a lot of time getting the mess off. :mad:

id clean it real good and put a coat of sealer over it and when you do paint it add fish eye remover to the paint but id still spend a day resanding the truck with soapy water and wet paper