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Painted exterior brick does not usually need sealing. Brick is a porous material, so you don’t want to apply a sealant that could trap moisture inside the bricks and cause erosion and structural damage. The risk of moisture-induced damage after sealing is higher in colder climates where trapped moisture can expand if it freezes. On the other hand, it makes sense to seal really old brick or kitchen backsplashes, where moisture from cooking can weaken the brick.

Masonry is an umbrella term that involves adhering individual building materials together using an adhesive, so many different things are considered masonry. These include constructing stone or brick walls or facades, installing stucco siding, installing backsplashes or tile floors, and even installing glass block windows, in some cases. Masonry materials include natural stone, clay bricks, concrete bricks, glass blocks, and tiles.

Staining or painting brick isn’t something to do on a whim. Make sure you really want to live with stained brick, because once you apply the stain, it’s permanent. Sure, it will fade over time, but you can’t restore the brick to its natural tones after applying a stain or paint.

If you want to avoid damaging your home's brick, you should always use a stain specifically formulated for masonry projects. These stains are designed to penetrate the porous surface of the brick and bond with it, unlike paints, which sit on the surface and are prone to peeling and flaking. Look for stains labeled for use on brick or other masonry surfaces. Avoid using regular paint on brick, as it will not adhere well and will likely lead to future maintenance issues.