I’d use the SEM “Bumper Bite” with layers of fiberglass cloth smeared with the bumper bite to fill up most of the void. Then use the bumper bite to smooth it over. Just think of that fiberglass cloth as “Rebar” for strength..as opposed to a big chunk ,that could fall off. Then strip the cover to bare rubber…and get the PPG bumper adhesion kit….contains a sponge with a cleaner wash….then a treated tack rag…then one coat off PPG one choice plastic primer….then 3-4 coats of 2k primer…block..and reprime with 2k primer…scuff with 400 and base/ clear…or single stage. I wouldnt trust epoxy to stick to bare rubber. I paint raw bumper covers all the time…and NEVAH used an epoxy primer over raw plastic/ rubber
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