Refinishing is a process where a special material is applied over an existing bathtub, sink or tile. This material is nearly as strong as porcelain and easily covers and protects tubs, sinks and tiles without having to buy new fixtures. Perma Ceram of Pittsburgh uses Porcelaincote, a patented material that is durable, glossy and beautiful. If your surfaces are maintained properly as suggested, they will last between 10 to 20 years.