Refinishing a spa or bath product describes the process and materials used to refurbish the entire surface of the product. Refinishing bathtubs and showers is a major industry in the U.S. , and is served by many franchise companies and independent contractors. These practitioners of the trade develop their proprietary materials or buy standard products from a limited group of basic material manufacturers. They are typically epoxy-based or acrylic-polyurethane coatings. They each have their advantages and weaknesses.

Spa surfaces can also be refurbished, but have more limitations.