instead of buying an entirely new unit. However, there are some steps for refinishing a bathtub properly, ranging from preparing the tub, sanding down the finish, and then applying the correct paint. Many home improvement experts advise only resurfacing tubs made from porcelain, as ones made from plastic or composite materials will not be as suitable for this type of procedure. It is vital homeowners take the time to choose the paint color and finish to match the rest of the bathroom colors.