A: No! Don’t! Bad Idea! Just say no to WD-40!
WD-40 and paint basically don’t mix. They really don’t like each other.
In fact, there are some paint shops that will string you up for even bringing a can of the stuff into their shop.
Basically the lube mixes with the paint and causes something called fish-eye. It’s a rather annoying and persistent problem. Which is why car painters go postal on people who bring the stuff in.