i think the standard binks double respirator cartridge would probably suffice; if you're working more than four or five hours, spend the money and get an extra set of charcoal filters (and change them out about halfway through). also, a cheap box fan, clean and new ($20, maybe) set to suck out, will certainly help.
(this is a solvent based product? single stage of two stage?)
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"The law, in its majestic equality, forbids the rich as well as the poor to sleep under bridges, to beg in the streets, and to steal bread."
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