Impregnate unglazed tiles? HG impregnating protector (product 13) is a special basic treatment for (new) unglazed tiles or flagstones. This unique tile sealer stops saturation and prevents dirt and (grease) stains from penetrating without altering the character of the tile or stopping the floor from breathing. The perfect tile sealer for impregnating unglazed tiles or flagstones.