Chimney Crown Sealer

MasonryDefender Chimney Crown Sealer is a flexible, waterproof coating that is applied to chimney crowns to protect chimneys from water damage. This flexible membrane is easy to apply with a paint brush and will last for years. Repairs both mortar and concrete crowns. This product is step 1 of a 3 step system.




MasonryDefender Chimney Crown Sealer protects most masonry or concrete chimney crowns. It provides a long lasting, flexible, waterproof membrane that protects crowns from water intrusion. This product is ready to use and can be easily applied with a paint brush. Use to repair minor cracks or imperfections on chimney crowns. Not for repairing severely damaged crowns with cracks larger than 1/4” or that have large voids of concrete or mortar.


Before use, read all directions for preparation, application, and safety information. Always test each type of surface before application for suitability and desired results before proceeding with general application. Surface and air temperature should be a minimum of 45º F at the time of application but not greater than 95º F. Do not apply if temperature is expected to drop below 45º F within a 4 hour period. Do not apply to frozen or frost covered surfaces. Do not apply to water saturated surfaces and/or when rain is expected within four hours unless adequate protection with a polyethylene film or its equivalent is provided. Store unused product in an airtight container above 32º F.


Surface to be coated must be structurally sound, not loose. Surface must be clean and dry. Place drop cloths at base of chimney to protect roof from inadvertent spills. Brush surface to be coated with a stiff poly or wire brush to remove loose particles. Larger cracks and voids can be filled with fast setting patching cement or a premium grade latex caulking. Chimney Crown Sealer may be applied over top of the caulk before it cures as the caulk will cure underneath the product. To produce a clean edge, place duct tape beneath the crown, over the top row of brick and then above the crown, one inch from the bottom of the protruding flue tile. Remove tape when application is complete.


Lightly mist the crown with water using a spray bottle. Using a synthetic bristle paint brush, brush a thin coat of material over the entire crown. Allow the first coat to set for a few minutes until it forms a tacky film, then brush a second, heavier coat over the first coat.
Coverage: Two coats of product will cover approximately 20 square feet per half gallon container, depending on texture and porosity of surface to be coated.
Dry Time: Dries to touch in 30 – 60 minutes. Product cures completely within 2 – 4 hours depending on temperature/humidity.
Clean-Up: Remove product from tools immediately after each use by scrubbing with a brush and water. To clean inadvertent spills from roofs, etc., remove excess and clean remaining product with a stiff nylon scrub brush and water. Rinse thoroughly.


Keep out of reach of children. Respiratory protection is not generally required during normal use and handling. The use of protective gloves and chemical splash goggles is recommended. Wash thoroughly after handling.


WARNING: This product can expose you to chemicals including Cumene, which is known to the State of California to cause cancer. For more information go to



If inhaled: Supply fresh air; consult doctor in case of complaints. For eye contact: Remove contact lenses if worn. Rinse opened eye for several minutes under running water. If symptoms persist, consult a doctor. If swallowed: Rinse out mouth and then drink plenty of water. Do not induce vomiting; immediately call for medical help. For skin contact: Clean with water and soap. For additional information, consult the SDS for this product.


SaverSystems warrants that MasonryDefender Chimney Crown Sealer, will remain intact and in place for 5 years from the date of application, when properly applied to a residential flashing of a chimney, stack or vent system according to label instructions. This warranty does not cover spalling, abrading, faulty construction and/or other defects which might erode coated surfaces. If MasonryDefender Chimney Crown Sealer fails to perform as specified, SaverSystems will furnish without charge, enough product to correct the condition as your sole remedy. This warranty does not include labor or cost of labor for the application of MasonryDefender Chimney Crown Sealer. SaverSystems shall not be liable for direct or incidental or consequential damages resulting from any breach of this warranty and fitness for use. Some states do not allow the exclusion of incidental or consequential damages, so the above exclusions may not apply to you. This warranty gives you specific legal rights. You may also have other rights which vary from state to state.