yeah none of us ware masks when we do fiber glass only when we sand cuze i don't like being different colors, and when you have jars of stuff and you don't know what is you just take a wiff hard to tell diff between lacquer thinner and prep-sal they look the same and then you also have clear coat so yeah you have to take a wiff and its a lot worse for your health cuze you can feel your nose hairs burn. well you got to figer that when you smell paint it goes into ur lungs and hardens which kills lots of people so yeah paint wins. good times. good time.
Why haven't you labeled the jars yet? Better yet, why weren't the jars labeled in the first place? Sharpies and duct tape are your friend.
This type of shit is frustrating. He knows the consequences but would rather keep wiffing than making simple adjustments to the process.