What is the best sealer to use on masonry

SiloxSeal is a silane / siloxane water-based high performance penetrative masonry water repellent. The product is free of solvent and hazardous ingredients. Silox-Seal (Silane / Siloxane) forms a hydrophobic barrier beneath the surface and seals out moisture while remaining highly vapor permeable. It will chemically bond with the substrate. The visual appearance of the treated surfaces will show nominal or no change resulting from product application. The benefits include enhanced resistance to efflorescence, freeze thaw damage, cracking and spalling. Cured system is resistant to ultraviolet light and may be used as a sealer for surface coatings.