Description Upol BPO Catalyst Polyester Body Filler Fibre Glass Resin Hardener 40g Sachet x2     Includes:  – x2 40g Upol BPO Hardener  A  pea-sized amount of hardener should be used with a golf ball sized amount of body filler. 40g Sachet BPO hardener for polyester body fillers. Can be used with all the U-POL and ISOPON polyester fillers, resins & wood fillers.   For more information in relation to the product view the Technical Data Sheet below- https://u-pol.com/au/product/fillers/complementary-body-filler-products/bpo-hardener-for-polyester-body-fillers/