3M 20126 Fiberglass Resin Liquid Hardener, Clear, 0.74 oz Tube

Bondo� fiberglass resin liquid hardener is designed specifically for use with Bondo� fiberglass resin and Bondo� metal reinforced filler. This hardener is easily mixed with resin or filler, a chemical reaction creates an extremely strong, waterproof repair material. The hardener must be used with a resin or filler for repairing autos, tubs, showers, sinks, pools, hot tubs, boats and more.