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Painted exterior brick does not usually need sealing. Brick is a porous material, so you don’t want to apply a sealant that could trap moisture inside the bricks and cause erosion and structural damage. The risk of moisture-induced damage after sealing is higher in colder climates where trapped moisture can expand if it freezes. On the other hand, it makes sense to seal really old brick or kitchen backsplashes, where moisture from cooking can weaken the brick.

Chimney mortar typically lasts 20 to 30 years, depending on its quality, local weather conditions, and maintenance. Over time, exposure to moisture, freezing, and thawing cycles can cause mortar to deteriorate, leading to cracks and gaps. Regular inspections and timely repairs, such as repointing or tuckpointing, can extend the lifespan of chimney mortar by ensuring the structure's integrity.

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.

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.