Plymouth Rubber Company (www.plymouthrubber.com) has developed an innovative method for moisture-sealing automotive harness components. Plyseal is comprised of a flexible PVC backing laminated to high-bond strength butyl rubber. These vinyl mastic pads have superior sealing properties and excellent chemical and abrasion resistance, with exceptional adhesion to materials such as steel, polypropylene, and ABS plastic. The formulation performs dependably at temperatures up to 130 °C and withstands automotive fluids, road chemicals, ultraviolet light, and stone pecking. It is designed to protect and seal wiring harnesses, electronic components, ducts, and body access holes.