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Yes, you can do German schmear on stone. You can account for the more textured and rough surface of stone by using a large paintbrush instead of a putty knife. A brush allows you to drag mortar across the stone to get it into all the cracks and crevices. However, a brush will cover more of the surface, so you may need a wet sponge to scrub excess mortar and expose more of your stone.

No, using a power sander on brick is not recommended because the force of the sander can destroy brick's fragile outer layer. Even using sandpaper on brick is discouraged because of the damage its abrasiveness can cause.

Cutting stone comes with a number of safety hazards. First and foremost, if you’re not comfortable with the equipment required to cut stone, including blades and grinders, you could easily injure yourself. The heavy machinery also poses a risk to your ears if you don’t wear proper ear protection; similarly, you need to wear eye protection to keep debris from irritating your eyes.

However, the biggest risk from cutting stone comes from the stone dust. When breathed in, stone dust can be a huge hazard to your lungs. Always wear a face mask when cutting stone to prevent inhaling stone dust, and thoroughly clean the work area when you are finished.

To avoid injury, we recommend hiring a stone-cutting professional, rather than attempting this job yourself.

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.