Answer
Sep 30, 2019 - 04:00 AM
Hello, Thanks for your questions. Yes the Green Building Supply Penetrating Concrete Sealer is appropriate and recommended for an exterior brick chimney. Because this is a vertical surface, we recommend spraying with a one gallon garden style pump sprayer. To achieve saturation, multiple coats will be required. Continue applying with light coats until the brick and mortar no longer accept the sealer. This will always be 3 coats or more. One gallon usually covers 200 square feet but this may differ depending upon porosity of the brick and mortar as well as the temperature and humidity. Do not apply in direct sun, below 50 degrees or within 24 hours of rain. This will not change the color or texture of the brick at all. If there is excess that runs down the wall, back roll with a 3/8" nap roller to even out.
