Use and store between 65° – 100°F (product and ambient temperatures), 45°F minimum. Remove surface contaminates such as water, dirt, rust, and petroleum products. Wax or otherwise “release” mold surfaces prior to epoxy application. All Rhino Hardeners are compatible with Rhino 1379 Gel and should be proportioned per the selected Rhino Hardener mix ratio. Mix resin and hardener for 3 – 5 minutes being certain to scrape the mixing container bottom and sides. Mix no more material than can be applied before pot life expiration.