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.