3M Liquid Hardener 1 Tube 0.37 fl oz., Use with Fiberglass Resin for Auto and Home Repairs Including Tubs, Showers, Sinks, Pools, Hot Tubs, and Boats, Waterproof Repair (00912) Size: 11 Milliliter Liquid hardener formulated for polyester fiberglass resin and Metal Reinforced Filler that require liquid hardener Triggers a chemical reaction with the resin for rapid curing Delivers a 100% waterproof repair Ideal for fixing auto bodies and boats Simple mixing yields a smoother hardener and filler blend Apply during the Fill stage of the Body Repair System Flash point: 93.3 degrees_celsius For industrial/occupational use only. Not for consumer sale or use ???? A quick compatibility check with us before ordering saves you time and hassle later.