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The best tool for drilling into brick or mortar is a rotary hammer drill which is a large hammer drill with low rotation speed and high torque. Regular drills with a hammer function are also excellent tools for drilling into brick when the diameter of the hole is 1/2 inch or less. It might be possible to drill into brick with a standard drill if you’re only drilling a very small hole, but note that masonry work will put a lot of wear on a standard drill, and the tool may not be strong enough to get through brick.

When painting brick, each application method has pros and cons. Spraying is much faster but may not penetrate the porous surface of the bricks. Rolling is effective for getting paint into the bricks but doesn't work as well on the mortar. Brushing is very time-consuming and also won't penetrate beyond the surface. For the best results, a combination of spraying and rolling is often recommended. If you use a roller, choose a thick option (at least a half-inch) and ensure the paint gets into all the crevices for even coverage.

The white stains you see on your bricks are likely efflorescence, which is salt and lime buildup. To remove efflorescence stains, simply brush them away with a stiff brush. For larger, more stubborn stains, scrub the stains with a water-detergent solution.

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.