Sealocrete Waterseal is a very effective, clear water repellent designed to improve the penetration of masonry in the rain without affecting its appearance. It can be applied as moisture to repel water while allowing the wall to breathe. It also protects against frost damage, exhaustion, mold and mildew growth and surface contamination. It is suitable for external use in bricks, cement mortars, concrete blocks and certain types of natural and artificial masonry. For external use only.