I agree with completely with Dan's comment about not thinning epoxy, but it's not a good idea to use any solvent to clean it off your skin. Doing so only helps it get into your body thru the skin.

Virtually all epoxies are toxic to some degree or another. Individual's tolerance varies, but the effects are cumulative and non-reversable. Once you reach your personal tolerance level, even the slightest whiff may induce a violent reaction. There's no way of knowing what your limit is or how close you are to it. Admittedly most of us never get to that point, but why take a chance?

The safest way is to use nitrile examining gloves or a barrier cream. Or at least use a waterless hand cleaner.

It's a personal decision, but I know someone who reached his limit using primarily epoxy glue.

OK, I'll get off my soap box.