A. Lucite® Cast Acrylic Construction with Microban® Antimicrobial Protection – Clarke was the first manufacturer of high quality acrylic walk in baths. Lucite cast acrylic is a technologically advanced non-porous material known for its high gloss, easy maintenance, stain and scratch resistance and durability. Most competitive walk-in baths are constructed of gel-coated fiberglass; a product type that is far less resistant to stains, cracking and chipping.