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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.

Mortar and thinset both serve the same purpose—tile adhesion—but have different compositions and use-cases. Thinset is heatproof and presents a wide range of possibilities due to the added polymers. Mortar is typically used for bonding stones and brick. Thinset is rarely used outside, while mortar is rarely used inside.

Drilling into brick doesn’t have to be a dangerous project if you prep and approach it with the right tools and techniques, but it does come with risks if it’s not done correctly. It can lead to significant issues, such as damaging the brick or affecting the wall’s structural integrity. Applying too much force can crack or chip the brick, while incorrect placement might compromise its load-bearing strength. 

Cobblestone can be made from many different types of stones but the most common ones, by far, are granite, basalt, limestone, and sandstone.  If you are laying a brick paver patio or other such project, the medium is different. It’s rare, but cobblestone can also be made from marble, slate, jasper, and other types of rock. Technically, you can make cobblestone from almost any type of rock, but if it is weather-resistant and stands the test of time is another question entirely.