well remember... your breathing in tiny sharp glass fibres.
epoxy resin is allrgiht i gues but man polyester just stinks badly!
at the worst if you cant find a mask to fit you could need a full face mask. expensive thoguh.
when we were working on the boat we had one of them hooked up to a hose n just let the hose run outside about 10 m from where we were working so we didnt really need a filter either
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