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Old 05-27-2009, 01:18 PM
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how to get rid of rust in the seams?

i bought a late 60's dodge car. the man i bought it off of was trying to restore it and got frustrated with it. he took the interior out and used some kind of stripper on the paint in the floorboards. The floorboards are solid but i guess there was some rust there. He the washed down the floor with some kind of acid. I have used acid in the past and know that it will clean metal but it has to be taken off and neutralizes immediately. Then prepped with cleaner and sprayed so it doesnt rust again.

I know this wasn't done so i have a feeling i have rust in the seams..... he didnt remove the acid or something because the floor is now caked with rust. I can sand blast with plastic media on the outside but how do i get into the seams? Surely i wont have to take the floors out? the rust leads right up to the seam and seems to trail into there. I thought of prying in between the seams and blasting but then i will never be able to get it all around the spot welds. I have chemical stripper and old acid residue in my seams....some people shouldn't restore old cars

how did the factory protect the bare metal of the inner part of the seams. i know they used seam sealer but is that all they used......are all the seams in old cars just bare metal with seam sealer to protect them?

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Old 05-27-2009, 05:29 PM
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When I remove original seam sealer from early mustangs it looks like seam sealer was put over bare metal. Sometimes the factory seam sealer kept the seams like new; many other times moisture was trapped by seam sealer and likely caused it to rust faster. I evaluate each seam to decide which ones to apply seam sealer. I sometimes omit seam sealer in places like outer wheel wells so water can't be trapped there.

I have'nt tried plastic beads because I thought they were expensive?

I have blasted floor boards and seams of convertible with sand if car masked off real good or if car is pretty stripped.

I don't think plastic beads or soda blasting will effectively remove rust.

You can rig or buy a device to allow you to spot blast with shop vac hose surrounding blast nozzle so you don't make a big mess.

I normally use a wire wheel in angle grinder from welding supply store to clean the seams pretty deep and quite fast (wear very good eye protection). I follow up with acid wash/rinse.

I typically clean a seam with wire wheel, Sand blaster and/or pressure washer followed by chemical treatment. After cleaning I decide if it is better to apply seam sealer to keep water out or omit seam seal to allow it to drain.

Last edited by 001mustang; 05-27-2009 at 05:45 PM.
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