I've done this with black wrinkle varnish. The baking (in my
apartment's oven all those years ago) produced two effects:

I don't want my paint to wrinkle. Will a non wrinkle paint
still be smooth if its baked?

What temp did you use for baking? I typically use a little bondo
to fill the pits in the castings. I think this will limit the
max baking temp.