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Epoxy over EDP Process?

#1
I haven't been able to find a definitive answer as to the process for painting over EDP. I will use the lacquer thinner on a rag test to make sure it's good, and if it is, how should I prep? Ideally, I would like to scuff with the appropriate grit, spray epoxy 1:1:1, then straight to base/clear. But in my experience, EDP is thin and I will sand through it in spots no matter what grit I use. So what grit should I use in this approach?
 
#3
If the EDP is in real good shape and OEM you can maroon scotchbrite and seal, done every day. I usually 320 DA lightly, then scotchbrite, because of scuffs or defects. Is this a collision job or restoration? If it is a restoration best to strip and put 2 coats epoxy, IMO.
 

Barry

Paint Fanatic
Staff member
#4
Both the above is perfect advice.

Since the e-coat tested good you can sand with 180, 320 or red pad and shoot epoxy.
 
#5
If on your C10 Id take to bare metal, one thing my blaster told me when he did my box this past weekend was that on one of the fenders there was a chalk or marker writing under the ecoat. Its just too big of a gamble with these Taiwan repro panels to leave it in my opinion.
 

Barry

Paint Fanatic
Staff member
#8
Thanks for the input everyone. Sounds like I better strip the EDP since they will be repro panels.
I have always had mixed emotions about this question since it passed the lacquer test.
Reason is I have been inside the ecoating automation plants and we cannot duplicate the perfect cleaning of metal before ecoat that the automation process does
.
But!! the million dollar question is how are the offshore people doing it.
Maybe we can do better, I just don't have the answer.
 
#11
we had some EDP panels come in that almost looked like rust underneath, like pebbles, maybe a 3x4 inch area. Sanded it to bare metal and it was just the e coat. The biggest problem is when the cleaning agent gets too hot and the parts dry before getting rinsed. But the e coat will most probably be peeling off it that happened. They say if the oxygen cannot get to the rust it cannot continue to grow.
 

Barry

Paint Fanatic
Staff member
#12
Had same thing happen on a door with my epoxy, shop was in 40s or low 50s that night and in morning shot epoxy with no heat.
Moisture on metal and 3 months later rusting under epoxy.
 
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