All masonry chimneys are porous. They absorb water every time it rains or snows or when the furnace creates moisture inside the chimney.
This will lead to damaged liner flue tiles or bricks & mortar joints cracking or eroding. Applying a masonry water seal will protect the life of your chimney by cutting down the water absorption by as much as 85%. This can save you thousands of dollars in future masonry repairs and chimney relining.
Our water sealer is guaranty for 10 years. It will allow the masonry to breathe while it will stop the water from going in.