Our UV protectant additive is to be added to our Stealth Epoxy Hardener “B” side. It can be added to any Epoxy to substantially improve its UV properties. Turn jug upside down a couple times to blend in. It is a UV inhibitor, reflector, and anti oxidizer. The 1 oz is for the 1/2 gallon epoxy kit, 2 oz for the gallon kit and 4 oz bottle for a 2 gallon kit.