I've often heard that using a bathroom exhaust fan to exhaust finishing odors is bad idea, but I'm sure there are certain conditions that would have to be present for it to really be a danger.
Consider this room:
9' x 12' x 7' South West corner: A door that opens to the main part of the basement North West corner: A door that opens to the great outdoors (screened)Consider this idea:
Mount a 140 CFM bathroom exhaust fan in the North East corner (opposite the 2 doors). If my calculations are right, that's about 40% more than the minimum CFM for a bathroom of that size.
Planned uses: Occasionally exhaust odors from primer, paint, mineral spirits, oil based stains, oil based poly, farting, etc. No spraying. Brush or wipe-on only. Small projects or small parts of large projects. e.g. stain a headboard, paint a dresser, etc. Not to be used when the air is dusty, although adding a holder for a furnace filter is a possibility.
What would it take for this to go boom?
FWIW, the fan shown below, placed on a stool by the door to the great outdoors hasn't blown the place up yet. Of course, it's only been about 35 years, so there's still time.
That thing is a beast. I don't know the CFM rating, but it'll dry a pair of jeans in about an hour.