I'm not saying that you can only apply filler to the bare metal, I'm just saying that you don't have to prime before filler you can go either way.
And you all know how paint suppliers love to sell you products that you don't need. And they will swear that you must to have it.
For years and years, we've applied filler straight to bare metal.
So why use twice the amount of epoxy primer than you have to. Apply your filler, and then apply your expoxy primer/sealer after you have your body work done.
The epoxy isn't going to help the filler stick any better than it would without it.
Frank
