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.