Best way to remove undercoating

[62lwbc10]

Any thoughts would be appreciated

[Sillyoldman]

Heat gun & Scraper? Not sure but have often wondered the same.

[Kabwe]

Heat gun and a scraper works great and you can wipe up the residue with lacquer thinner.

[Angryman117]

I used a needle gun to remove the under coating on the frame and bottom of the running boards on my 47. Had all of it off in a few mins. However don't use it on thin metal.

[67GMCkid]

I have had decent results with Easy Off oven cleaner and for some reason it seems the original smelling stuff worked better than the pleasant smelling stuff..

I try to pick a time when it is going to rain a few days in a row, or even overnight.. The high humidity keeps the stuff from drying out. As long as it stays wet it keeps on working..
I just spray it down close, the garage door and walk away.



I also found if the undercoating is thick, go over it and scratch it up, the more you break the surface finish of the undercoating the better it will work.

Once its done working, hose it off..




I don't know if this will work on the new more modern forms of rubberized undercoatings or not, The times I have done it. it was on the 50+ year old asphalt based stuff...

[1project2many]

Yep... needle gun / needle scaler. Good for many other jobs, too.

http://www.harborfreight.com/media/c...mage_11986.jpg

I use an Ingersoll Rand but then again, I use it every day.

[62lwbc10]

Dang Ive never even seen or heard of a needle gun. Pretty cool. How does that work and what else can it be used for?

[1project2many]

Scaler is like many tiny ball pein hammers pounding away at metal. They knock rust off with a vengeance but they don't make as much dust as a grinding / sanding / blasting. They'll take off powder coat, old hardened undercoating, multiple layers of old paint, and they'll "round" rough surfaces and close the pores of blasted metal. You'll find plenty of uses for it.

Big downsides are noise and higher air needs. Wear ear protection.
http://www.youtube.com/watch?v=yJRf6zrulC4
http://www.youtube.com/watch?v=t6f-Smtph8Y
http://www.youtube.com/watch?v=TgPLxGjwES4 <-- At 1:25 he gets going.
http://www.youtube.com/watch?v=eRcZzTLWANs <-- 1:10 or so
http://www.youtube.com/watch?v=g2RI5AVkFDA

You can find plenty more to watch.

[1958Warrior]

I used a propane torch and a scrapper for the thick stuff and rags and thinner for the residue on my fire wall.

I've seen a electric hot scraper before ,can't remember where.

Would try the oven cleaner, I guy told me he used it to strip the paint on his car also.(just watch the paint) I'll try it on the fender wells.

With that in mind ,I would think paint stripper should work too. Brush on and hose off?

[mach92bill]

Contact cement cleaner does a good job of dissolving that old struff. When I ran out, I used gasoline,,,,carefully!

[OrrieG]

I have a heat gun for removing finishes off of furniture, wood trim, etc. Works great without any flame. Wifes hair dryer just would not get hot enough. Then a 3m purple shreaded wheat disc to get the residue, they do not clog like regular discs.