dplf epoxy over laquer

[Harvey]

I am getting ready to prime my 75 camaro with dplf epoxy and it says when epoxy is sprayed over lacquer substraights that are not crosslinked and then allowed to set overnight before applying another coat that lifting can occur.has anyone ran into this problem,looking for advice on how to approach this.the car allready had a coat of black epoxy on most of it when I bought it,it was sprayed over a very sound original paint.the only things that were not epoxied were the inside of jams,inside of trunk and lid,inside of doors,and cowl.the car is now down in peices,I stripped out all the old cracking seam sealer and am going to apply new after the epoxy,my plan is to paint in pieces and reassemble car.I was going to DA the old epoxy down and reapply 2 coats of white epoxy followed by 2 or 3 coats of ncp 271 gray to block the car out.the car will be painted a solid bright white bc/cc.any advice would be appreciated.thanks-Harvey

[Harvey]

please lend a little help guys,I dont want to screw this up.I am a regular poster on this board,but had to re-register for some reason,I was the one doing the 70 challenger over about a year and a half ago with a lot of help from this board-Thanks-Harvey

[Len]

Hi Harvey
Using epoxy over lacquer can be done but it will depend on a couple different factors....

1. If the lacquer is "factory" applied it will be more stable than if it was applied later.
2. If the primer contains chemicals that can negatively effect the lacquer you could lift or melt the lacquer under the primer.

A quick test can be done by applying some mixed epoxy with a brush to see how it will turn out. After the test epoxy dries scrape or apply some tape to it to see how well it's bonded to the surface. The epoxy could cause the lacquer to loose it's grip on the substrate but, no matter what, you should know that the lacquer will be the weakest link of the coatings.

[Harvey]

thanks for the reply len,the laquer is the original 75 paint job that came on the car,should I shoot one coat on and wait a day to put the second coat on?

[Len]

Applying the prime in two coats that are far apart would probably help but you need to make sure you're within the recoat window of the epoxy or you'll need to sand in between coats. I would still do a small test area first just to make sure you're not going to have a disaster when you spray.