If nobody comes up with the magic solution (there probably is one). I use Lanolin (or any hand product containing it), it gets under whatever and lifts it from underneath. Lanolin works for building foam and epoxy resins, though it does require repeated applications. I've also used baby oil and synthetic motor oil, with some success. But a lanolin hand cleaner works best for me, with an abrasive hand cleaner to take off the really stubborn spots at the end.
Any solvent strong enough to desolve the Herculiner, may burn your skin.
Gloves are best, but a coating of Vasaline on your hands, keeps most adhesives, coatings or paints from sticking to your hands very much.
Using really strong solvents to clean your hands, can cause a couple of layers of skin to peal off in a week or so. It looks kind of like a disease and can really mess up your social life.