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Old 05-03-2006, 09:53 AM
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stripping off undercoating..what a mess

Hey guys, has anybody had the fortune to have to strip off undercoating on their rod that some yoyo put on to "protect it"? I really want to undercoat my roadrunner with por-15 but there is a TON of that undercoating crap and i know im gonna have a heck of a time getting it off...does anyone know any tricks to remove it and/or can i simply put the por -15 on the TOP of the undercoating? Will moisture leading to rust happen if I do this? help.

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Old 05-03-2006, 10:42 AM
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stripping off undercoating..what a mess

There is no magic solution here. Just lots of hard work involved. Try using a heat gun or propane torch to soften the undercoating and then use a scraper to remove the softened material. Be very careful you don't catch it on fire and have a fire extinguisher handy just in case. Make sure there are no gas fumes in the shop as well. You can try oven cleaner, lacquer thinner and brake cleaner or acetone to soften it as well. Again be careful if you are going to use a flame. Eastwood makes a product to soften it as well. You can also use the flapper discs on your grinder after most of it is off. If the undercoating is not put on to well they will all work to some degree, but softening the undercoating and hard work with the scraper is what you will need.
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Old 05-03-2006, 11:01 AM
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Homebrew is right.
I set mine up on jack stands, pulled the wheels, got a propane torch, putty knife, lights and a creeper. Spent a few hours each night working on it. Took about a week and a half to get it really clean, wheel wells and all.

It looks endless when you first start, but persistence pays off and it'll be worth it.

Things you'll need: Gloves, eye protection, long sleeves, several widths of putty knives, fire extinguisher. Open the garrage door or window and set up a fan to circulate some air. If you have a canvas welding tarp, cover your floor. Makes clean up easier but be wary of molten goo. And get used to the smell, it'll be in your sinuses for a week or more afterward.
I wouldn't do this if the garage is under the house, attached is still iffy.
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Old 05-03-2006, 11:37 AM
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stripping off undercoating..what a mess

Those are all really good tips 428ho. One thing I did forget to say is DON"T try to sandblast it off.
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Old 05-03-2006, 12:54 PM
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And about the yo-yo thing. I'm happy its on there or I wouldn't have the car. Mine is thick, looks like it was re-applied every year. This car has bad quarters, but the trunk pan and floor pan aren't rusted in the least from the outside, only a little pitting from the inside in the trunk. Looks like that 'mess' did its job, though it'll suck getting it off...
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Old 05-03-2006, 01:58 PM
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Yep! Lots of hard work and elbow grease.
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Old 05-03-2006, 02:57 PM
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I've used kerosene to help remove it. Like others said, no matter the method you choose it won't be easy and will involve scraping and a mess, only way that would be easy would be to bring it somewhere to be done, but not as easy on the pocketbook.
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Old 05-03-2006, 04:01 PM
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I remember reading somewhere about using dry ice to solidify it and then scraping and chipping it off. Anyone else ever hear about that?
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Old 05-03-2006, 04:44 PM
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stripping off undercoating..what a mess

Dry ice is used to freeze gum in carpets and on tile floors. They then hit it with a hammer and it shatters. Should work for thick undercoating as well.
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Old 05-03-2006, 05:36 PM
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http://www.classiczcars.com/forums/s...hlight=dry+ice

Here's a dry ice method, but working from underneath may be tough.
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Old 05-03-2006, 05:37 PM
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That Eastwood undercoating "softener" works on the cheap rattle can type undercoating but it does absolutely zilch on old asphalt type stuff. It even has a disclaimer about what it will not work on. I am about burned out on Eastwood's overpriced junk.
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Old 05-03-2006, 07:12 PM
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A wire brush wheel attachment to a drill works pretty well at removing a good amount but even with this lil helping hand, it's still a lot of backbreaking work and not to mention messy. Also suggest using a torch to help soften the material and scrape it off and nooo a lighter does not count as a torch
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Old 05-04-2006, 07:03 AM
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A hot water pressure washer or steam cleaner might work,then again it may just spread it around and make a real mess.

I have sandblasted lots of the stuff off cars over the years,but it takes a heck of a lot of sand and gets pretty expensive at 75 bucks an hour.
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Old 05-04-2006, 07:32 AM
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Did the heat gun and a gasket scraper. This got most of it off. I'll be hitting rest with airplain stripper, then navel jelly to deal with the rust that was under it. There are times I think I'd have been further ahead to replace the floors.
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