Arlington Bathtub Refinishing. Depending on the material used, your bathtub, vanity, and shower have a limit to their lifespan. Compared to these porcelain and enamel tubs with fiberglass, acrylic, or cultured marble that have a longer lifespan. Although the changes are not obvious, the consistent use of these commodities will lead to upgrades that will turn out to be more obvious as time goes.