Clear Guard® First Seal™ (Reactive Penetrating Sealer) is a pre-packaged water-based reactive water repellent sealer for use on unsealed concrete and unsealed concrete overlays. Clear Guard® First Seal™ may be applied as soon as 48 hours after the concrete is poured. Clear Guard® First Seal™ is specially formulated to allow for the high PH of new concrete and is designed to penetrate deep into the pores of the concrete. Clear Guard® First Seal™ will react with the concrete and create a water resistant surface and a hydrophobic interior, thus reducing water and chemical absorption and reducing the damaging effects caused by freeze-thaw and de-icing salts.