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