A bathtub or shower liner is a solid piece of acrylic or PVC plastic designed to precisely fit into the contours of your tub or shower unit. Unlike refinishing, in which a spray coating of epoxy, urethane, or polymer material is applied, a liner is a solid unit that is manufactured to the precise contours of a factory tub or shower and installed by a professional team.
When you contract with a firm to install a liner, a local installation pro will first visit to take precise measurements and perhaps photos of your bathtub or shower unit. A central office takes this information, identifies the manufacturer of the tub or shower, then fabricates an exact shell of the tub or shower unit from 1/4-inch thick ABS acrylic, using vacuum-form technology.
The acrylic shell is similar to the material used in many tub and shower units but is a thinner layer of acrylic. It can take as much as eight weeks for the shell to be prepared, but once it is delivered, installation takes just a few hours. First, the old fixtures and drain fittings are removed, then the shell is inserted right over the old tub or shower unit, using silicone adhesives and two-sided tape.