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Yes. Black stains are more than an eyesore. Some black stains can pose health concerns, especially for those with asthma, allergies, or other respiratory conditions. Some stains can also damage the brick’s structural integrity, harming the mortar and resulting in more expensive repairs.

If you’re attempting to mix and pour your own mortar, expect to pay between $5 to $10 for an 80-pound bag of mix. The cost to repair mortar, however, can range from $300 to $500 for a 20-square-foot wall. The larger the area and the more extensive the repair, the higher the cost.

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.

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.