Drywall sanders remove dry, excess joint compound from mudded seams to leave a smooth, level surface when preparing walls and ceilings for primer and paint. They spin a large-diameter sanding disc to produce faster, more uniform results than hand sanding. Their vacuum port connects to a compatible dust extractor or collector that captures dust to reduce respiratory hazards and prevent accumulation on floors, surfaces, and tools. Drywall sanders are commonly used in new construction and renovations after hanging, taping, and mudding drywall.