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A 4 inch pneumatic disc sander is one of the most useful finishing and prep tools in an auto body shop because it covers the gap between a broad dual-action sander and a narrow die grinder. When you are featheredging paint, blending filler edges, cleaning corrosion, or refining weld areas on patch panels, the right 4-inch tool gives you speed without sacrificing control. That is exactly why buyers comparing sanders for body repair should pay close attention to regulator design, pad size flexibil …