I have found that using micropore tape on the mask's edges gets a good seal and I do not have to tighten the (crappy 3M elastic) straps as much.
CVS has (an expensive (equivalent NZ14$!) roll of) hypoallergenic tape that is easy on facial skin, so keeping the seal over a shift is less difficult. Stubble or not.
But if anyone were to come up to me and cough at me in a shop when I'm not wearing a mask and pretend it was a joke - oh boy. I know some good ol' boys up here that would remonstrate with him, quite effectively. I'd leave the vicinity to preserve, what's the expression, oh yeah, "plausible deniability."
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