Melamine cabinets have been around for several decades. These sorts of cabinets have a plastic coating that makes their surfaces hard and durable. They are difficult to scratch or wear down, resulting in many years of use. However, over time the melamine can begin to chip at the corners, which results in your cabinets appearing worn and dull. To repair the chips, you will need special melamine paint.
Fill the chipped area with putty and let it dry. You could also use a two-part body-filling material if you want a more durable filler. When using the body-filling material, wait until it is set to the point where you can still scrape it off. Run a razor blade along the surface to remove any excess, and make it even with the melamine surface.
Sand the filled chip surface with a fine-grit sandpaper after it is dry. Give it a day to dry to really be sure that it is completely solid. Use a light touch to sand the filled area. This is to remove any putty or body-filling material that is still located above the surface of the cabinets. Wipe it clean to remove any dust.
Dip a small artist paintbrush in melamine paint that is the same colour as the cabinets. Wipe off the excess on the edge of the can. Paint the chip area to cover the putty or body-filling material. Feather the paint out over the edge of the putty to blend it in. Let this dry completely. If a second coat is needed, sand the surface lightly to rough it up, and add a second coat after the first is dry.