Next generation GacoFlex E5691 epoxy seals and primes concrete decks in a single step prior to the application of GacoFlex coating systems. This three-component penetrating sealer and primer is specifically formulated for use on concrete surfaces; but may also be applied to plywood. Install as directed on Gaco’s Product Data Sheet. (* The minimum cure time of E5691 when used as a concrete curing agent prior to the application of GacoFlex coating systems is being tested. Not intended for application to green concrete to prepare for the installation of a conventional roofing system).