In the 1970s house I'm renovating, the internal doors are all varnished ply. Instead of buying new doors, I thought I'd paint the existing ones and put on new handles. I've done one (two coats water-based primer plus acrylic top coat) but it doesn't look great. I'm now wondering whether this is a silly idea or maybe I should use oil-based paint? Any hints (or rebukes )? Many thanks.