I'd like to hear some thoughts on the black EDP coating found on new sheetmetal parts, say, for this example, a radiator support and a fender. I've heard differing opinions on this. A local body man said it should all come off (and would so rather easily with a DA), but i've heard other people say just scuff it up and prime and paint it.
I am thinking for the best final finish, it would be best to take it off, especially on the outside of the fender. But as far as the rad support, I would not be looking forward trying to sand it off all of those irregular surfaces and nooks.
I am fixing up my 71 Nova for street cruising, not for showing, but don't want paint falling (flying) off of it either.
Whatcha think?

I'd like to hear some thoughts on the black EDP coating found on new sheetmetal parts, say, for this example, a radiator support and a fender. I've heard differing opinions on this. A local body man said it should all come off (and would so rather easily with a DA), but i've heard other people say just scuff it up and prime and paint it.
I am thinking for the best final finish, it would be best to take it off, especially on the outside of the fender. But as far as the rad support, I would not be looking forward trying to sand it off all of those irregular surfaces and nooks.
I am fixing up my 71 Nova for street cruising, not for showing, but don't want paint falling (flying) off of it either.
Whatcha think?

As long as it's not peeling off your fine to paint over it. :thumbsup: Sand and prep as usual.

The cowl hood on my El Camino was just scuffed and painted and a big part of it lifted off to bare metal. Since then I remove it from all metal. To do the core support glass beading will remove it fast and leave a good surface to etch prime and then paint.

http://i80.photobucket.com/albums/j199/64elcamino/zmeano/DSC00017.jpg

Phillip........ OUCH!!!!!!!!!!!!!

X 10 on what Phillip said.

Wow Phillip, that sucks. I have painted a fender and a hood in the past without having that issue. What a bummer. Great looking car BTW.

Well If I was Philip I would want to sand it all off :yes:

I just scuffed it up & primed it:o I took it to metal anyplace filler was going to touch it. after seeing Philips car I think its time to break out the sanders:noway:

I am buying that Hot Rod dvd series looking for ideas and help on different things and the one I just got showed taking all of the coating off. He was doing a quarter panel on a chevelle convertible. I can't remember if he said why he took it off, but he did take it all off and then prepped and primed the quarter.

I think that pic says it all. While I can certainly believe others have left it on and had some successful results, I think I'll be taking the time to remove the coating because that's exactly what I don't want to happen. (Might as well...the car seems to be taking forever anyway. :D) I'm dying to drive it again. Will post some pics soon. Thanks everyone:hurray:

No doubt I'm gonna be painting the wife's bug and I hadn't planned on removing it from the new apron I put on there but after seeing that pic I'm not risking it again.
I ought to call the guy that bought my Camaro from me and see how the fender and hood are holding up. How long did it take to do that Phillp?

Steve not sure of the time frame. I bought the car from a friend. He had it for about 5 years and it happened just before I purchased it. So I had the hood repainted after the purchase. If the paint prep was the cause of the peeling then the coating would still be on the hood. As you can see it all came off. I thingk the EDP is just to protect the metal while it is stored.

The way I was shown, was to take a rag soaked in lacquer thinner and rub it on a area, if it takes it off then remove if.

The way I was shown, was to take a rag soaked in lacquer thinner and rub it on a area, if it takes it off then remove if.


I tried that and Lacquer thinner didnt take it off any more then it takes off my epoxy primer:confused:

I have 2 quarter panels and a hood with some of that on it under the primer so I guess I need to start praying to the car gods...

I watched on muscle car once were they talked about that stuff and they said it didnt need to be removed just scuffed up...

crap I need to stop progress until I get this sorted out:(

Ok I looked around this is what I found

EDP coated using Electro-Deposit Primer, and the only surface preparation required is scuffing the surface for better paint adhesion. In using this primer, the part is protected from rust as long as the EDP coating remains under the paint.



JEEEES SCARED THE CRAPOLA OUT OF ME :eek:

Still, I'm pretty sure I'm going to remove it at least from the outsides of all panels. Jury's still out on the insides and the core support. I'll have to think about that some more. That pic from Philip was too scary:eek:!!!

It is possible the hood just didn't get the EDP adhered well, your results may vary :)

I don't think they would coat the panels with something you would have to work so hard to remove. I bet not one body shop spends the time to remove that stuff at all. if it was to protect the panel in storage they would of shot it with some kind of oil that you wipe off...

I don't think they would coat the panels with something you would have to work so hard to remove. I bet not one body shop spends the time to remove that stuff at all. if it was to protect the panel in storage they would of shot it with some kind of oil that you wipe off...
I wouldn't think so either, and the only reason I asked is because a local, very experienced body man and hot rod builder said to me very matter of factly that it should all come off and the bare metal epoxy primered. I was a bit surprised, (and seriously bummed at the prospect of more work) because prior to that I had heard to just scuff it up and go. Anyway, seems like a small price to pay to sand it off the outside of body panels, but probably won't go through the extra effort for the core support and other low vis areas.

I'd like to add a bit more to this. I think that the cheap parts or lesser manufacturerers (if that's a word) either don't put this on heavy or use a crappier product. As I stated in a post above I just sanded and primed and painted over this coating in the past but after seeing the problem that Phillip ran into I got worried about a current project I'm working on.
So tonight I'm sanding on the VW and I put a new rear apron on with this coating and I figured I'd remove it for paint just to be safe and it came off real easy. I mean REAL easy. With about the effort it took to sand the panel as you would for normal prep almost all this coating came right off. In the past I have sanded pretty heavy without it all just coming right off this came off with very little effort.
So my thoughts are it's just not over done on some products and some products have it put on heavier. I don't know if I'm rambling at this point but I thought I'd add this new experience to the discussion.

Thanks to all who replied to this topic. I am adding this reply to bump this up to the new posts, because I am still interested in hearing other good or bad experiences or preferences for dealing with this finish.
I am very close to starting the body work on this car after aligning and welding in the new panels. As I mentioned earlier, I will probably be sanding all of the EDP coating off of at least the outside of the body parts with a DA sander before priming, filling and painting the body. It does seem to come off pretty easy, so I figure it's worth the extra effort.

(it needs to be updated, but pictures of my project can be seen on my website below)
Jon

i have never had a problem with just scuffing it with red scotch brite pads.. i did this for 4 years at a body shop and never had a return