The Stovebolt Site Forums The Shop Area Paint and Body Shop Primer under original paint?

I was wondering if anybody had run into the same problem I have. I purchased an original 52 door. I took it down to bare metal primered and painted. No big deal. Under the original champagne paint was what appeared to be a black primer. Nothing absolutly nothing would touch it. I tried three different chemical strippers, 60 grit sand paper. I did get it removed by using a angle grider amd a wire wheel followed by lots of sand paper. I hate losing that much metal trying to preserve the item. Anyway I was just curious if anybody had a better idea, Jimmie.

better idea: why remove it if "nothing will touch it"?

it's EDP, Electro Deposit Primer, excellent manufacturers primer

Bill

Bill, Thank you for the info!! I wish I could duplicate the primer, as it some tough stuff. Up untill this afternoon the only way to remove it that I had found was with a grinder/wire wheel. I guess that being of German Irish extraction it is genetic not having it perfect. Since you have more knowledge on the subject than I, how well will modern coatings adhere to the EDP? Jimmie.

I used 60 grit on a Dual Action sander to remove it from the doors and in those areas I needed cleaned up to get the dents out. I left almost all of it on the rest of the truck. I agree it was a hard to remove. Good stuff.

I am with red ,anything that tough! should deserve to stick around a little longer!

That is alpo prime, is there a reason You
are removing it ? Its understandable if there is
a problem that must be repaired under it...
otherwise just handscuff it with 240/360 then
prime it....Bill B

Bill wit the Red58, if it's really a '52 door I don't think it's "ElectroDeposition Primer". Correct me if I'm wrong but I believe that was first introduced by duPont in 1963.
Bill_B, what's alpo prime, I've never heard the term?
I had a thin black primer under the original interior paint on my '50 garnish moldings. It wet sanded just like any other cured paint with 220 paper and I finished it with wet 3m Scotchbright pads before I conditioned the bare steel.
Denny Graham
Sandwich, IL

Denny - Jimmie sez it didn't just sand like any cured paint, and the only black undercoat I know that's bullet proof is EDP .... I've found the same on TF sheet metal and saw no reason to fight it or research what it actually was .... considering the general process of electodeposit really started in the 30's or earlier [tin cans], no tellin what GM used in 52, if it was in fact an "original" door

also alpo is aluminum phosphate I think

Bill

you got more energy than me Gent !..to work that hard removin it ...i woulda just scuffed an painted over it ..lol

Hi Guys, I appreciate everybodys thoughts. After spending over 3 hours on removing all the paint and MOST of the primer, on an inside door moulding/garnish, I bow to your knowledge, and my achin' arm. At this point I don"t care if it is EDP, alpo, or kibbles and bits. As long as it passes the "sock test" I am going to paint over it. lol. The door looks to be original. The interior side looks to be orginal color, but badly faded. However you never know for sure. As Red58 sez it gums up the 60 grit sandpaper fast. You would think after 55 years it would have dried out enough to sand a little easier. As I said in my original post I was curious as to what the black stuff was. All I lost was a little time and sweat. Plus I gained a bit of knowledge. And like fishin' I like to think the big guy upstairs dosen't count the time workin' on the truck against you. Thanks again guys, Jimmie.