There is one small insert on my machine that has a black triangle on it with two little spots of black missing. Can I use black acrylic paint like from an artist painting kit? Just need to touch two specks of paint down.

This is for a 1980 Bally Mystic. There isn’t a clear coat, as far as I can tell. The playfield has been wiped with naphtha and waxed once before, when I got it in November.

Is this the correct procedure?: clean the area with naphtha, paint, wax.

Would appreciate any suggestions. The playfield is in very decent condition and I don’t plan to do anything to it. These two little bare spots bug me, though.