Well I was getting paid at the time (even if paid poorly).
It beat sitting around doing almost nothing (which was about the level of activity the boss provided).
It was clear no one else wanted to do the paint work
I just ended up doing it one day, and I made it fairly clear to the boss I was a lot better at it than he was.
I think the breaking point was the day his stupid styrafoam cup supply method broke because he had no clue how simple it was for oil based paints to eat the bottom of the cup away, and his supposedly smart one handed method of holding the cup and the airbrush with the intake pipe pressing down too hard on the bottom of the cup resulted in him getting paint dropped all over his nice shoes.....
Here let me get that for you Mickey.... (dumb drunken asshole...).
At that point I was basically the shop's painter.
Can you make it this shade (hands me a paint chip from the client), groan ya shure Mickey (groan, this is old redwood house stain, how the hell do I make this into slate grey?). By the way, there isn't a human walking the planet that knows more about making exact paint shades out of garbage paint sources than me
I always hated it when the client changed a shade AFTER I had painted the &^%#$*&^@ model in the last shade only just that day. If you think masking a canopy is tedious, try an an office tower