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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.

Stone houses used to be much more practical, but with the advent of stronger and cheaper materials like concrete, they aren’t seen as much anymore. There are some parts of the world where it makes sense to build with stone, and they are usually next to a stone quarry. Stone is, however, very weather-resistant, which is why many homes near the sea and on mountains are still built with local stone.

A traditional German schmear uses mortar, making it unsuitable for adherence to painted surfaces. Professionals recommend removing any existing paint before applying mortar. However, you can rough up the painted surface and clean it to test if the mortar will stick. Remember that the underlying paint's texture and color may affect the schmear's final appearance—so starting with a bare brick wall will ensure the ideal finish.

Yes, it is normal to see some minor hairline cracks in brick or mortar over time, often due to natural foundation settling. However, not all cracks are harmless. You should be concerned and contact a masonry professional for an inspection if you notice cracks that are getting wider or longer, or if new ones keep appearing. Other serious warning signs that can indicate significant structural or foundation damage include large vertical cracks (especially those that widen as they go up), stair-step cracks, L-shaped cracks, and deep horizontal cracks. Factors like temperature changes, moisture, and structural loading can also cause cracks to form or worsen.