Here's a surprise: Did you know that painting your interior doors black instantly makes your space look more expensive? This simple change can make even inexpensive doors look like something truly special.
To paint over ANY surface, without sanding, use a product called 'ESP Easy Surface Prep', available at hardware and paint shops. Wipe on, wipe off and paint in 90 minutes. Works well over enamel paint , without having to sand. SAVES HOURS of work. It was recommended to me by a professional painter.