Roy: I've done it both ways and I really have no preference.
Here is the straight of it....suppose he sprays epoxy on the repair site or all over for that matter. He then lays on a coat of polyester filler and will sand the filler to repair the dent or whatever. I always have to add another coat of filler (nobody gets it perfect with the first coat). I doubt any bodyman is going to spray more epoxy before the second coat of filler so it goes on over bare metal. I sometimes have to add body filler 3 or 4 times, sanding between each to get the repair where I want it.
Point is, even after the repair site (filler) gets its' final sanding you're going to end up with some filler directly over bare metal. Is that so bad??...not in my estimation as long as the car doesn't sit for weeks/months before the final body work gets done and the filler receives a fresh shot of epoxy..
I like epoxy, but it's not practical to shoot it before every application of filler and it always takes more that one coat of filler to get it "just right".
Just my $.02..
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