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You should generally drill into the mortar joints when installing shutters on brick. Mortar is softer, which makes drilling easier and puts less strain on your tools. It also lowers the risk of cracking a brick—something that’s a lot harder to fix. Mortar holds fasteners well enough for standard shutters, and if you ever need to patch the holes later, it’s a much simpler job than dealing with damaged brick. Just keep in mind that if your mortar joints are too thin or the hardware calls for brick anchoring, you'll need to check the manufacturer’s recommendations and adjust accordingly.

Drilling into brick or mortar requires the use of a masonry drill bit. Masonry drill bits appear similar to standard drill bits except for the leading tip of the bit. The tip has a bulky carbide arrow-shaped end slightly larger than the rest of the bit shaft. Standard or high-speed drill bits designed for making holes in wood or metal don’t have the ruggedness or design shape you need to drill into brick. They may not go through the brick at all, and if they do, they’re more likely to overheat, crack, or dull before you finish drilling.

Yes, it is essential to prime or seal a brick fireplace before painting. Brick is a porous and highly absorbent material, so without a primer, paint can seep into the surface, resulting in uneven coverage and allowing the natural brick color to show through. To avoid this, apply one or two coats of a masonry primer. The primer will seal the brick and provide a smooth, uniform layer for the paint to adhere to. Ensure the primer is completely dry before applying the topcoat of paint.

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.