Why am I getting pigtails when sanding?

Why am I getting pigtails when sanding? While pigtails can be created by a number of problems, the most common cause is that some particulate or material will build up in between the sandpaper and the surface being sanded, creating a high point. This high point then gouges the surface, much like a rock would if stuck in a polishing pad.

While pigtails can be created by a number of problems, the most common cause is that some particulate or material will build up in between the sandpaper and the surface being sanded, creating a high point. This high point then gouges the surface, much like a rock would if stuck in a polishing pad.
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