Mini tubs, advice, do's & don'ts?

My pops all he wants to do lately is paint. When the seat delete came out he said give me the center panel. Him being my dad, I did as told and this is the result so far.

View attachment 1715226696

He thinks he's got another four or five hours left before it's done but it's looking good to me.
The old man's a bad ***... that's cool!