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A needle gun scaler ( also known as needle scaler, or needle-gun) is a tool used to remove rust, mill scale, and old paint from metal surfaces. The tool is used in metalwork applications as diverse as home repair, automotive repair, and shipboard preservation. Its main advantage is that the needles automatically adjust themselves to contours, making the tool a good choice for cleaning irregular surfaces. A needle gun can clean an area to bare metal in seconds and compares well to other scaling tools in terms of accuracy and precision. Prior to painting, it is desirable to feather any edges between metal and old paint. Since bare metal surfaces will flash rust soon after exposure to the atmosphere, paint should be applied as soon as possible after chipping. If flash rusting occurs prior to coating, further chipping, cleaning and sanding may be necessary.