No, if you seal your stone, the sealer you use must be a breathable sealer. If you use a sealer that is not breathable, it will not allow any moisture that may have entered the wall to escape, causing further damage to the stone. If you choose to seal your stone, a silane or siloxane based sealer is recommended which will not affect the color, texture, or breathability of the stone. A sealer that we like to use is Prosoco Siloxane PD.