Bondo 912 Liquid Hardener is the trusted catalyst designed specifically for activating Bondo Polyester Fiberglass Resin and other resins requiring a liquid hardener. This clear, easy-to-mix formula triggers a fast chemical reaction that delivers strong, durable, and 100% waterproof repairs every time. Perfect for automotive bodywork, boat and marine fixes, home repairs on tubs, showers, sinks, pools, and more—apply it confidently to fiberglass, metal, brick, wood, concrete, and other surfaces. Packaged in a convenient 0.37 oz tube and formulated under strict temperature-controlled conditions, it ensures maximum freshness, performance, and professional-grade results for DIY enthusiasts and pros alike.

Key Features & Benefits

• Compatible with Bondo Polyester Fiberglass Resin and other resins needing liquid hardener
• Creates a fast-curing chemical reaction for repairs ready in approximately 2 hours
• Produces strong, long-lasting, and fully waterproof results
• Clear liquid formula mixes easily for smooth, consistent application
• Ideal for auto body, marine, and household repairs on various materials
• Convenient 0.37 oz tube size for precise dosing and small to medium projects
• Made in the USA by 3M for reliable quality and performance