Paint Or Undercoat?

POR 15 is way overpriced, and is not a good dirt, dust and rust eliminator. I would use a good brand of epoxy primer, and then paint the same color underneath as the car will be.

If you are set on a POR 15 type of paint, just use Rustolem, its basically the same thing as POR-15, and costs less.

POR-15 is not meant to be used on new metal (your floor panels), and is questionable on blasted metal. It is very hard to paint over once it cures. If it is not applied right, it will come off in sheets.

Jut my .02. I know their are guys who swear by it, but buyer beware.

barracudadave67