Undercoating Removal

[JimKueneman]

Ok I followed suggestions here and else where on removing the old undercoating with a heat source and scraper (actually a Dremel oscillating tool with a scraper blade works great). Now what is the recommend way of removing the remaining residue so one can spray epoxy primer with high confidence it will adhere correctly?

Thanks
Jim

 

[65hemi]

I used brake cleaner to get the remaining residue off. But then you need to wipe down with a thinner because the brake clean apparently leaves an oily film that paint won't adhere to.

 

[ckessel]

Oven cleaner works well too. Just make sure the surrounding areas are protected.

 

[texas69bee]

Naptha works well too. When I did mine I used the same tool your talking about but I didn't heat it up. That way it chips off in chunks and less residue. Then when the blade got dull I just ran it across the grinder.

 

[JimKueneman]

Naptha works well too. When I did mine I used the same tool your talking about but I didn't heat it up. That way it chips off in chunks and less residue. Then when the blade got dull I just ran it across the grinder.

Basically what I am doing. Heat is for the stubborn areas

Jim

 

[Triple Black 73]

I used a propane torch, a scraper, and a pick to get most of the tar off. I followed that up with a wire wheel on an angle grinder and a wire brush on a straight grinder. The last step was to use brake clean and a scrubber to get the last little bit. I wiped everything down with paint thinner before using Rustoleum rusty metal primer. I found I averaged about 45 minutes to take 1.5 sq foot of tar yuck to bare metal.

The next time I'm going to have the whole car hot water soda blasted.

 

[Coronet 14]

You could try this
http://www.eastwood.com/eastwood-s-under-gone-undercoat-ing-remover.html