Offering style and design with the strength and durability of acrylic material, this shower base features a built-in, reinforced support. ProCrylic™ is a durable, high-gloss acrylic that provides all of the benefits of acrylic without the need for the rough, abrasive fiberglass backing. A professional custom shower base installation, including tiling, can run over $1000. If you dislike the look of pre-made fiberglass shower pans, and you feel capable of building a custom shower pan yourself, a beautiful and affordable shower base is possible for a couple hundred bucks. The fiberglass resin is a thick substance that needs a catalyst to harden. Fiberglass is a very durable material that will bond to almost any surface, including plastic, metal, wood and Styrofoam. For laying up fiberglass on hard materials such as metal it's important to thoroughly scuff the surface to get a strong bond. Cleaning Dirty, Hazy Shower Doors. One day I found myself standing in my shower with plastic grocery bags over my sneakers, rubber gloves on my hands, safety glasses and a bottle of extra strength cleaner C.L.R. (calcium, lime and rust remover), trying to figure out if I could get my shower doors clean before the fumes over-powered me. Fiberglass molds are commonly used to make multiple copies of a part that may have a complex shape. Some of the advantages of using a fiberglass mold are: the materials are inexpensive, they are easy to make, last many years and can be used to produce hundreds of parts.