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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.

Yes, concrete is significantly stronger than masonry, especially if the concrete pour includes reinforcements, like steel rebar. Concrete is a uniform material that can withstand compression, sheer force, and tensile force as long as it’s reinforced. Masonry involves the use of mortar or grout to connect individual building materials, like brick, stone, or tile. Mortar and grout are also reasonably strong and resist compression well, but they don’t come close to the strength of poured concrete.

You should use cement for a chimney crown. The purpose of the chimney crown is to protect the mortar below from water damage and the effects of weather. For this reason, chimney crowns should only be made using cement. When repairing a crown, use caulks and sealants designed for cement repair rather than mortar repair.

Yes, brick should be clean before staining to ensure the best results. Dirt, dust, mold, mildew, and other substances on the brick can prevent the stain from properly adhering to it. Thoroughly cleaning the brick allows the stain to penetrate and bond to the surface more effectively. Cleaning typically involves using a pressure washer or a stiff brush with mild detergent. However, stubborn residue may require a specialized masonry cleaner.