Hi Joanne, ( sorry for the punt), youre best bet is
to sand paper all the sides you want to paint,but use
a fine sand paper, this will take off all the shine
and thats what you want, this way you will have a
better change for the paint to stick to the formica
for the undercoat use a good quality let it dry well
then just sand it again but very lightly clean away
all the dust then paint again with undercoat, let it
dry, ( the trick is toi have a good undercoat) because
the finish coat is like water ( very thin) and that
should do the job for you….. try not to paint the hinges.
have a nice week end….John 2000