Is it advisable to apply enamel type paint over a water base paint?
No, it is not. Enamel type paints harden and become brittle with the time, but the latex paint (water base) underneath remains flexible. As time passes, the latex film keeps flexible and moves with the expansion and contraction of the substrate more than enamel film in outer can do. This phenomenon compromises the adhesion of the film enamel and can cause its peel or flaking in long-term.
