A melamine cabinet was originally only available in white, as you were not able to refinish them. For this reason, they were associated with cheap kitchens. However, due to development in paint products, you are now able to refinish your melamine cabinet doors. First, you need to clean the doors using a strong detergent and TSP, to get rid of greasy marks. Second, sand the doors with 80 grit sand paper. Remove the last grains of sand with tack paper. Third, apply primer, and sand again, but with a 240 grit sand paper this time. Finally, it is time to paint, but make sure that the paint is suitable for a melamine surface.