Fiberglass is reinforced plastic finished with a polyester gel coat. The smooth and glossy surface of the tub is a result of this gel coat. Fiberglass tubs are an affordable, lightweight option and come in a wide array of styles. The smooth and glossy floor of the tub is very slippery when wet and obviously water in the tub is a common occurrence. A fiberglass tub not treated for slip resistance is very dangerous. According the Centers for Disease Control and Prevention (CDC) approximately 266,000 people are injured in the bathtub or shower a year in the US.