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AMD panels black EDT coating #2811929
08/22/20 11:52 AM
08/22/20 11:52 AM
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Washington
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hemienvy Offline OP
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What is the EDT coating ? Electrically Deposited T................?

Everyone says best practice is to take the panels down to bare metal for epoxy primer prep.
My car had the metal replacement work all done already when I got it, the AMD panels all still have
the black coating.

A good portion of this car is still original sheet metal in good shape, only very minor surface rust, original paint.

So I have a combination of original and AMD metal. The plan so far is to media blast the whole car, I assume
the media blast will remove the EDT coating as well as the old original paint.

It will be easy to remove the coating on outside of the car, but what about areas like inside the doors
(new door skins already welded on) or inside the cowl ? And then, assuming I can get these difficult areas clean,
how do I get a paint gun in there ?

What about something like chemical dip-stripping for the doors, will that remove the EDT coating ?

Re: AMD panels black EDT coating [Re: hemienvy] #2811931
08/22/20 12:03 PM
08/22/20 12:03 PM
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Auburn WA
Prodart440 Offline
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I am not a body man, or paint, but I don't understand why you would need to remove it. I can understand scuffing it before primer and paint. I have a set of 25 year old quarter panel skins for my Dart that still have the EDT coating and have zero rust from sitting.


Aaron

68 Roadrunner 383/AT
69 Dart GT Conv. 383/AT
05 Dodge Ram 4x4 Cummins
06 GoManGo R/T Daytona #757
68 Coronet 440
Re: AMD panels black EDT coating [Re: Prodart440] #2811940
08/22/20 12:14 PM
08/22/20 12:14 PM
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Washington
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hemienvy Offline OP
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ProDart you might be right. I keep reading and learning.

For example, Raybuck says their panels are coated with EDP, Electrically Deposited Primer. They say to just
scuff it up, you don't need to totally remove it.

Although that still might prove difficult inside the door for example.

Re: AMD panels black EDT coating [Re: hemienvy] #2812062
08/22/20 07:19 PM
08/22/20 07:19 PM
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Akron, ohio
76orangewagon Offline
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I have always removed the EDP coating and here's why....I had a painter ask me if I wanted to risk my $20,000 paint job to a base coating applied by a 10 year old Taiwan boy making .60 cents a day. Let that sink in.

Re: AMD panels black EDT coating [Re: 76orangewagon] #2812080
08/22/20 07:57 PM
08/22/20 07:57 PM
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Eagle, Idaho
Neil Offline
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I had a car painted that came with a coated reproduction hood and all we did was lightly sand it and primer over it before painting it. It was fine the whole time I had it.

I guess you could sand it off, but I would not bare metal any parts that you can't get primer and or paint onto later.

Re: AMD panels black EDT coating [Re: hemienvy] #2812476
08/24/20 07:30 AM
08/24/20 07:30 AM
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GMP440 Offline
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Don't sand off the EDP primer. It's a good protective coating on the part. Just scuff with 400 and and put primer on it. Just did this recently.

Re: AMD panels black EDT coating [Re: GMP440] #2812488
08/24/20 08:22 AM
08/24/20 08:22 AM
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North America
Warhawk Offline
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Here you go:

EDP stands for Electro Deposit Primer.

1. First thing you need to do is a solvent test on the primer. I use basecoat reducer and a rag to see if I can get the primer to wipe off. If it does, it failed the solvent test and it all needs to come off and put on a good epoxy.

2. I have seen rust UNDER EDP coatings. Most of these panels are made overseas and the prep is not the greatest. Would you trust your paintjob on top of that?

3. AMD has always passed the solvent test for their EDP primer, but you should ALWAYS check each panel. If it were me I would test, and if they passed the test leave it on the interior panels, but still strip the exterior and epoxy prime.

Hope this helps.

Re: AMD panels black EDT coating [Re: Warhawk] #2812547
08/24/20 11:15 AM
08/24/20 11:15 AM
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Mass
DAYCLONA Offline
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Originally Posted by Warhawk
but you should ALWAYS check each panel. If it were me I would test, and if they passed the test leave it on the interior panels, but still strip the exterior and epoxy prime.






Agreed, this has always been my approach the last few decades of doing bodywork regardless of the panels source, all exterior finishes are removed, no need to chance paint reactions down the road...

Mike

Re: AMD panels black EDT coating [Re: 76orangewagon] #2812566
08/24/20 11:53 AM
08/24/20 11:53 AM
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British Columbia
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chrisf Offline
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Originally Posted by 76orangewagon
I have always removed the EDP coating and here's why....I had a painter ask me if I wanted to risk my $20,000 paint job to a base coating applied by a 10 year old Taiwan boy making .60 cents a day. Let that sink in.


Bingo! its just a shipping coating. if you trust your whole paint job to that foundation, go for it. what could go wrong?

Re: AMD panels black EDT coating [Re: chrisf] #2812898
08/24/20 11:42 PM
08/24/20 11:42 PM
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Florida STAYcation
Doc Fiberglass Offline
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eek

A $20,000.00 - I’m sure VERY NICE - OEM type paint job ! eek

You restro guys SLAY ME .... smoke

Re: AMD panels black EDT coating [Re: Doc Fiberglass] #2813035
08/25/20 10:58 AM
08/25/20 10:58 AM
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Posts: 14,614
Eagle, Idaho
Neil Offline
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Body shops here prime and paint over the coating on those aftermarket panels every time. I guess if you've have one that's obviously gotten wet and/or the surface looks questionable then I'd strip it to be safe.

https://raybuck.com/edp-coating-body-repair-panels/

Re: AMD panels black EDT coating [Re: Neil] #2813240
08/25/20 06:37 PM
08/25/20 06:37 PM
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Weatherford, Texas
RapidusMaximus Offline
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Well I guess shame on me cause all I've ever done is scuffed it and shot it, never an issue and I've never installed anything but ÀMD parts, one of their reps long ago told me not to remove it unless it was damaged or something obviously wrong with it...just scuff and go and that's what I've done, granted I'm certainly not a professional and I only restore my stuff so it's just my twocents


1968 Plymouth GTX 440 4 Speed Dana
1967 Small block Dart under construction (almost finished)
1974 Dodge P/U Long Bed Stepside 318 Auto
1976 D300 in work
1981 CJ 7
2016 Dodge Ram Hemi 1500
Re: AMD panels black EDT coating [Re: Prodart440] #2813391
08/26/20 03:57 AM
08/26/20 03:57 AM
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Mardi Gras-Land
340SIX Offline
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Originally Posted by Prodart440
I am not a body man, or paint, but I don't understand why you would need to remove it. I can understand scuffing it before primer and paint. I have a set of 25 year old quarter panel skins for my Dart that still have the EDT coating and have zero rust from sitting.

My friend owns a shop and works with it plenty. He light sands it and epoxy coats it. No reason to strip it off. He never has a problem

Re: AMD panels black EDT coating [Re: 340SIX] #2814256
08/28/20 09:32 AM
08/28/20 09:32 AM
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North America
Warhawk Offline
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https://www.youtube.com/watch?v=yIKREdHTI7E


This is exactly how I prep any e-coated panel. Many times I have gotten panels that are " E-Coated" only to find out it is a cheap black primer that only resembles and e-coat. DO THE TEST!! It only takes a couple of seconds and then you know.

Re: AMD panels black EDT coating [Re: Warhawk] #2814311
08/28/20 10:52 AM
08/28/20 10:52 AM
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Washington
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hemienvy Offline OP
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Good advice.
If the coating passed the wipedown test, how would you scuff up the coating for primer
in a hard-to-reach area like inside the door ?
Even media blasting would be difficult because you can't get the nozzle in there.

Re: AMD panels black EDT coating [Re: hemienvy] #2814423
08/28/20 02:01 PM
08/28/20 02:01 PM
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Little Detroit Offline
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3m scotchbrite pads - red is the equivalent of 400 grit , all that is needed is a mechanical adhesion . red scotchbrite will scratch por-15 and that is hard as a rock.







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