The Stovebolt Site Forums The Shop Area Paint and Body Shop Epoxy primer?

I am trying to find out more about epoxy primer. Does this primer create a barrier seal to prevent moiture from reaching the metal surface?

Yes, it does. What I do: sand blast metal, shoot with epoxy primer to protect until I can get to final bodywork. Scuff epoxy and apply plastic filler, high build prime with 2k urethane primer (cheaper than epoxy)

Thank you for your helpful information. I am going to get some pictures on here of the surface rust that I have left on the metal after much sandblasting. My only concern that I have now is how well the epoxy primer will adhere to these rusty surfaces.

My experience is to wire wheel after the metal gets exposed to air-moisture like yours did. I just hate to see all your hard work go to waste. Remember to clean your metal before the epoxy goes on.

A wire wheel doesn't leave the 'bite' 80 grit does for the paint to adhere to. Wire wheel works good for removing stuff but sanding is still called for. Epoxy wants a minimum of 180 grit to bite into.

Epoxy Primer also has a window for top coating primers. Just make sure you follow the Manf spec's. I actually shot PPG epoxy primer on my underside of my burb then painted with a 2 stage. It came our really nice. For my topside I Epoxy/Body filled/Primed/Painted.

The "window" is if you dont want to have to sand between coats. If you exceed the "window", you need to scuff the paint to ensure the next material will adhere.

Many paint lines do not allow application over epoxy primer. This warning would apply to the "window" only and not be applicable if the epoxy is allowed to fully cure and then sanded/scuffed prior to applying top coat.

In other words, when applying subsequent material within the "window", you are relying on a chemical bond between layers. After the "window", you are relying on a mechanical bond between layers.