pen wrote:
Errm....if it is a "lovely antique", is etching the surface and
painting it the best thing to do? Although of course MDF is not
normally a feature of antique furniture! If you need a bathroom
cabinet, why not sell the antique and buy something more appropriate?
Not that I'm trying to dictate or anything, just that your eventual
heirs might curse you for ruining a valuable piece.

It's not an antique. Rub it over with cellulose thinners, Jizer,
or WHY, and roller some paint onto it.