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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.

It is possible, albeit a lot slower, to break up a rock using water. You would do this by freezing and thawing the water. You could create some initial holes or cracks in the rock, then pour water into the cracks or holes and allow them to freeze (so it's best to do this in winter or in colder climates). Since water expands when it freezes, this puts pressure on the inside of the rock and causes it to crack. You could continue to pour more water in and let it freeze to continue to break up the rock.

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.