Painted door panels and seats

While stripping my car down for paint I noticed that my door panels, arm rests, and rear seat was painted. Looked like it was spray bombed. They missed the underside of the door panels and the very back of the rear seat (the part that curls into the trunk area). Im suprised that this did not peel off! Is there a special paint to buy so that I can finish this off or should I look at new panels and such?

Also since we are on painting I would like to repaint my column and dash. I've hear of buying SEM Paint (I think thats what its called). What do you all recommend?