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Why do I sometimes get swirl marks or fish eyes when disc sanding with a pneumatic random orbital sander?

April 26, 2017Disc eyes fish marks ORBITAL pneumatic Sander sanding Swirl

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Why do I sometimes get swirl marks or fish eyes when disc sanding with a pneumatic random orbital sander?

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Swirl marks, also called fish eyes, are usually a result of insufficient air pressure into the sander causing the sander to slow down. Random Orbital sanders should run with a minimum of 10,000 RPM. Any slower and swirl marks may appear. The incorrect grit for a particular application may also cause swirl marks.