My old garage studio used to get so bad I'd have to open both doors just to breathe. Ended up routing a simple inline fan through some dryer duct straight to a window cutout. That setup moves about 200 cubic feet of air per minute, which is enough for most small spaces. What kind of window access do you have to work with?
Had a similar scare last year with resin fumes. Installing a proper exhaust fan made all the difference, pulling the bad air straight outside. Cleared the studio up in minutes and gave me real peace of mind.