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You should use cement for a chimney crown. The purpose of the chimney crown is to protect the mortar below from water damage and the effects of weather. For this reason, chimney crowns should only be made using cement. When repairing a crown, use caulks and sealants designed for cement repair rather than mortar repair.

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.

The choice between limewash vs. whitewash brick depends on aesthetic preference and the desired outcome. Whitewashing creates a softer, more opaque finish, suitable for a rustic or shabby-chic look. Since the solution is paint-based, you can use it on painted brick, unlike limewash. Limewashing offers a more natural, textured appearance, allowing the brick's texture to shine while providing a breathable, protective coating. Conversely, whitewashing is also more forgiving when it comes to application, while limewashing requires more skill but offers a more traditional and durable finish.

The difference between river rock and landscaping rocks is size, smoothness, and use. River rocks are smooth and flat, as if polished by water, and come in diameters between 1 and 8 inches. Landscape rock can vary in size from small pea gravel installations to car-sized boulders. However, landscaping and river rocks are interchangeable in many situations. River rock is best for pathways, walkways, garden bed mulch, water features, and planting accents, while small landscape rocks can serve as a walkway base, gravel playground areas, and filler between pavers.