I used te International brand (available at a lot of places) melamine paint. They had a lot of colours and it was very good. I have also used the Ronseal brnad but it was pants!
My brother in law swears by a product called ESP and he is a diy nut.
ESP isnt a paint. It stands for Easy Surface Preparation. It is a clear liquid that you put on a surface with a cloth. It is an excellent product that gives you a base for the paint to adhere to.