I have a rental property that the last tenants scratched the countertops by cutting food on them and then sanded them down. They just look hazed bad. When we were waxing the cabinets, we tried putting some of the wax on the countertop and it really brought out how they were supposed to look. These are Formica Laminate, black. I am looking for some kind of top coat that is safe for food and brings out the original shine. Also, do I need to sand down the rest of the countertop if I do that?