I think the OP meant the "Natural Chemistry" spray accidentally got in his face, not the "PAM". But I suspect 30 minutes of dry time was not enough for the
cage to have no remaining dampness from the PAM, plus I'm guessing (not sure?) that it was sprayed directly on the cage, whereas most seem to spray PAM on
paper that is used for substrate once dry...I'm not sure if that matters either. I've never used PAM personally, I just know you have to be really careful how you
use it, as it's NOT harmless for snakes. (permethrin is the active ingredient in PAM & has neurotoxic effects)