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While painting can certainly change the look of a chimney, you should think twice about giving your brick chimney the old landlord special.

Painting brick is porous, meaning it’s full of tiny holes that can soak up moisture. Those holes also allow it to dry, though. So, when you paint it, you trap any moisture inside, providing an opportunity for mold, mildew, and water damage.

Paint also shows wear faster than naked brick. This means that once you paint a brick surface, you’ll have to keep painting it to maintain a clean look. A paint job is also harder to undo on brick because of its porous nature. Once you paint it, it’s hard to go back without some serious power washing—another added cost.

No, using a power sander on brick is not recommended because the force of the sander can destroy brick's fragile outer layer. Even using sandpaper on brick is discouraged because of the damage its abrasiveness can cause.

Removing paint from brick can have both aesthetic and practical value. Some people prefer the timeless look of bare brick, making it worthwhile to remove old paint layers. Brick also lasts longer when unpainted, as paint traps moisture, causing the brick to deteriorate more quickly. If your brick walls are already in bad shape, stripping the paint off might do more harm than good.

Depending on the amount of soot present, you can vacuum some of it using a brush attachment on your vacuum cleaner. Then, remove the leftovers with a mild cleaner, such as dish soap or vinegar mixed with water. Before applying a cleaning solution, saturate the bricks with clean water to prevent the cleaner from penetrating beyond the surface and causing structural damage to the bricks.