If the kids are sweating heavily they are going to be difficult to paint period. I would see about having them wipe their face with a paper towel or wet wipe.
There are two products, nearly the same, to consider. The first is "Barrier Spray" by Mehron, and the second is "Final Seal" by Ben Nye. I don't remember the chemical name but you can think of them as soluble liquid plastics. Basicly they help seal the face. You spritz the face and in a very few moments it dries then you can paint the face right over it and its even better it you spritz the face a second time after you've painted the face. If you do this, and the child doesn't start rubbing his face, I have seen children run through the sprinkler and jump in the pool, and the face painting stays. Now if they stay in the pool for the next hour of course the paint comes off, but Barrier Seal helps protect the artwork. Now add soap and everything comes right off.
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