Hot Rods Primer over POR15

Morning Fellas


I’m sure this has been covered and yes I went down a rabbit hole on this but didn’t get a definitive answer. Will epoxy primer stick to POR15?? And if not what would be the best primer for this application. I have a few spots, nothing major that need to be finished out that currently have POR15 on them. This is in the base of the drip rail on my 55’ Fairlane. Thanks in advance

 

POR 15 makes a tie coat that allows paint to stick to it. That's what I would use and then you can paint over it and it will stay stuck.

 

I would personally strip the por15 off. Especially if it's gotten any sun

 

Read my thread about painting over POR15
https://www.jalopyjournal.com/forum/threads/por-15-bad-reaction.1228066/

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The lower structure that the spare tire mounts on a Model A was pretty rough on my car. I straightened it and coated it with POR 15 probably 5 years ago. I'm working on getting the body straight and ready for paint. I scuffed the POR 15 panel a bit and painted over with Sherwin Williams catalized primer and it looks fine. It looks the same as the other panels that didn't have POR 15 on them. That's my experience.

 

Proxy is for clean , bare , white metal !!!

 

I think you know the answer, by not finding the answer.
I would not apply epoxy or any other primer over POR15.
I’ve painted for 41 years and I don’t take chances with failure.
Too expensive and time consuming to redo.
Strip off the POR and get it to bare metal, then epoxy.

 

Sand it, prime it and paint over it.

Dave

 

I agree with the majority here, sand that stuff off and work back up, bare metal, primer, top coat.

Also you mention location is in the drip rail. I'd look at the sealers used for this area and find out what is suggested a a base for them. I know that this area can be just painted, but I also know that it is the meeting of at least 2 or 3 different pieces of metal and is a common flex and rust area. The 50s cars didn't have a sealer gooped in there like later cars, but they didn't have a lot of more modern better stuff either. Is this a resto or a rod/custom?

 

I've been using it for over 30 years. Almost exclusively on undercarriages, frames, floor pans. If I want to topcoat it much later, I will put a coat of primer on it when it is just at the last stages of being tacky. Then I can scuff, and shoot undercoat, or Zolatone, or paint over it easily. POR is a lot tougher to sand than primer!

 

As @chopolds said, though I have not used por for a very long time,I thought his method of dusting with primer was written on the can somewhere.

 

POR comes right off with brake fluid.