Miracote 7084-5GP 5 gal MiraGard Nano-Glass Sealer is a clear, single component, water-based, lithium-fortified potassium colloidal silicate cure and seal compound that integrally waterproofs and densifies new and existing pool and spa plaster finishes. Based on superior inorganic mineral technology, MiraGard Nano Glass is also suitable for other cementitious materials such as concrete, mortars and masonry.