how to remove undercoating
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Senior User
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how to remove undercoating
Any thoughts on how to remove that old, hardened, rubberized spray-on under coating? Paint thinner perhaps? I'm making S L O W progress mannually scraping it, don't want to spend the money on bead blasting the stuff. Fortunately, the fenders are off the truck so I can pretty much put them in any position I want. Just want to be done with it. Suggestions anyone?
Junior User
Joined: Jan 2007
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A friend of mine used a torch and wire brushed it off after heating it. Came off real easy. Was on a 70 Dodge Dart. He had the car on a rotisserie at the time though. Made it a whole lot easier. I'm not sure if it will work on all kinds of undercoating though. The undercoating on his Dart looked like it had been there a while since it was on the flakey/brittle side. Might not work on fresher undercoating.
Last edited by rustfarmer; Jul 3, 2007 at 07:11 PM. Reason: spelling
Postmaster
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Originally Posted by Woodsman_30350
Heat gun and a scraper. Comes right off and then clean with acetone.
Some used a small torch too, but you would have to be really careful doing that (IMHO).
Elder User
Joined: Nov 2003
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From: green bay, WI
kerosene was what seemed to work best for me. At least getting most of it off. It softened it pretty well for me so could scrape and wipe it off. Done outside of course. Anyway you go or look at it, not a real fun and easy job and going to be a mess.
Logistics Pro
Joined: Feb 2005
Posts: 3,952
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From: Upper Left Coast
Diesel fuel will probably work about as good as K1 and will be a whole lot cheaper.
I like the heat gun idea more though
Cheers,
Rick
I like the heat gun idea more though
Cheers,
Rick
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From: Waynesboro, Virginia
Don't overlook the grease from good ol KFC. I didn't use it to remove undercoat from a vehicle, but it did remove all the same stuff from my hands....I guess I ate it with the chicken! Better than that orange stuff, plus tastes better too.
Paul
Paul
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Thanks for all the advice - I did try the torch and scraper routine last night and it worked pretty well - yes, need to be careful the paint doesn't bubble on the other side (voice of experience here).
Senior User
Joined: Feb 2003
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From: Auburndale, Florida
We used aircraft paint stripper - let it soak for awhile then it comes off in long strips. Do wear rubber gloves and don't get the stuff on your hands. We had the car on a rotisserie and it made it a lot easier. If you have a good heat gun that will also work but it seemed like more effort to us. I don't think there is really an "easy" way of getting the stuff off - you just have to find what works for you and keep after it.
Good luck!
OilLeaks
Good luck!
OilLeaks
Senior User
Joined: Feb 2003
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From: Auburndale, Florida
Aircraft paint stripper is (I think) a stronger type of stripper and it comes in various name brands but always called "aircraft" paint stripper. Formulated to strip the stuff off of aluminum I believe. It does seem to work better than the regular plane old "paint" stripper which is also sold under various name brands. We got ours at Home Depot but you can get it in most stores where paint and supplies are sold. Use in a well ventilated area and use gloves as per the recommendations. Brush it on kind of heavy and then let it sit for awhile...once it starts to bubble you will see the undercoat loosen then wrinkle up...at this point you can take a paint scraper or putty knife and just scrape it away down to the bare metal underneath. Some of the places where the undercoat was real heavy required two or more applications. It's messy...it's slow...but if you're patient the energy required is low and it does do a good job!
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