Pettit Protect "Epoxy" -- Really!
For what it is, Pettit Protect seems to be fine. It dries as hard as rock and looks to be adhering very well.
Much of my doubt about its "epoxy-ness" stemmed from some small residue of a mixed batch remaining liquid in a closed can overnight. But given that, I got careless and left about 1/3 gallon, mixed & stirred, in a closed can. That stuff had cured to a stiff, rubbery solid in less than 24 hours. The only way I can account for the difference is that the first bit was left out on a cold night, while the larger batch was inside my heated "boat tent" -- and therefore must have cured more quickly.
The stuff does seem to smell like paint, and does seem initially to dry like paint, but it also cures to a very tough coating, and looks like it will do nicely.