[wvguy]

couple questions. so it was primed but never painted? If that is the case primer will fail if not topcoated. If its a oil primer should topcoat no longer than 48hrs and if its latex no longer than a week. Primer is not paint it is not made to be scrub, clean or last not top coated. I would clean with tsp its cheap 3-4bucks and will prep the surface us a brush to remove any loose paint. then I would prime with a latex primer such as kilz or zinnser123 or sealgrip from ppg. just dont use a nomal drywall primer you need extra bonding. then topcoat with a latex paint.
hope this helped