Bill, DEFY Extreme Wood Stain is a newer, and improved version of the old epoxy formula. The new Extreme Wood Stain does not contain epoxy, however it does contain zinc, which does a better job at preventing mold and holds up better to UV damage. The Extreme Wood Stain is a better stain and lasts longer than the old epoxy product, which was discontinued several years ago. If you had the epoxy product on your deck, you can switch over to the Extreme without any problems. It’s made in the exact same colors and it has the same look, just better performance.