[Auf los!]

Thanks, Markus, but no, all the paint removal attempts came AFTER the spray painting.

I received two perfectly primered housings. How hard could it be to spray matte black paint, right? So I sprayed, but had a flaw, like a hair. So I sanded that part and sprayed again. This time it was a particle of dirt in a different place. Sand, spray again. Got runs or drips. Before I knew it, I had WAY too much paint on the housings.

Okay, so have to start all over again. Brake fluid has worked for me before, and does NOT affect the underlying plastic. But the brake fluid won't soften and remove the primer. I tell ya, this primer is like ceramic powder coating or something. It is hard as nails.

I looked on the Web, and the suggestion was to try rubbing alcohol on acrylic. No effect. So that can be added to the list of things I've tried.