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Common causes include water leaks, settling, and impact. Address underlying issues to prevent recurring damage.

You should wait at least 24 hours for drywall mud to dry before sanding or applying another coat. However, the exact drying time depends on several factors, including the thickness of the application, room temperature, humidity, and the type of compound used. Thicker layers, or projects in high humidity, may require 48 hours or more. Lightweight compounds tend to dry faster than heavier, all-purpose ones. You'll know the mud is ready when it feels completely dry and firm to the touch and has changed to a consistent light color. Sanding too early can cause smudging or gouges, so patience is essential for a smooth finish.

Wall anchors are suitable for drywall and plaster walls, which are common in most homes. However, different wall materials may require specialized anchors. For concrete or masonry walls, you'd typically use concrete anchors. When dealing with other wall types, such as brick or tile, specific anchors designed for those materials may be necessary. Always consult with a hardware specialist or check the manufacturer's recommendations to ensure you select the appropriate anchors for your specific wall type.

Plastering and skimming are two different techniques for finishing walls. Plastering involves applying a thick layer of a plaster mixture—typically containing gypsum, lime, cement, sand, and water—to create a new surface. This process often requires multiple coats and is used for repairing significant damage or creating decorative textures. Skimming, on the other hand, is a technique that involves applying a thin layer of drywall compound or joint compound over an existing surface to smooth it out, covering minor imperfections, small cracks, or uneven textures for a polished look. Plastering is generally more costly and labor-intensive than skimming. Although some people use the terms interchangeably, they refer to different processes and materials.