This has been beat to death, and we will never reach a consensus. This is what I know about it. The procedure came about when the OEM started using corrosion resistance coatings. The epoxy was meant to replace these coatings on MODERN sheet metal. This was also before the reduction in heavy metals in primers. In my 30 years in the body shops around here I have never seen it done, even on modern cars. Every shop I worked in in the last 20 years warrantied their work for life. Every paint rep I've talked with about it, told me it was a waste of time and materials. Will it work? Yeah if done correctly. Is it worth it? Not as far as I'm concerned. In my 40 plus years of collision and restoration, to my knowledge, I've never had a filler failure. So in my opinion, it's a very expensive fix to a nonexistent problem. To the OP finish it out, or prime and drive. Shitty work looks much worse than no work at all.