A high grade surface sealer and curing membrane formulated from acrylic resins and a hydrocarbon solvent carrier to provide a durable penetrative sealer to a wide variety of surfaces including concrete screeds brickwork masonry and fibrous sheet materials. A non-degrading system which can also provide a stable substrate to receive subsequent finishes such as epoxy resins acrylic coatings and cementitious screeds etc. Can be applied to green concrete and to both horizontal and vertical