That is the problem, if you paint the lot first, the glue might not stick, or it will stick at first then lift off later. Choice of paint is whatever you prefer, I hate using gloss paint, so used matt, it is more forgiving and dries quicker than gloss. I didn't mask the ribs, I was just careful, and as the ribs were varnished first, it was easy to wipe off any paint that had gone astray.......