Greg Paolini: Curing Sander Swirl Marks

Tuesday, September 27, 2011 | Reader Comments | Dust Extractors | Sanders

Greg Paolini


In this article, Gregory Paolini shares a story about one of his students and why they were getting swirl marks while sanding. Gregory Paolini is a nationally recognized woodworker, author, and woodworking instructor.  You can learn more about him by visiting his website at


The Battle Against 'Swirl Marks'

Thursday, November 1, 2007 | Reader Comments | How-To | Sanders

David McGibbon

by David McGibbon, Festool Service Technician

Swirl marks can be caused by...

Bad Sandpaper

Little groups of loose grit particles get imbedded onto some areas of the sandpaper. They can then make scratches that show up in the stained finish as darker lines where a denser layer of stain can accumulate. This is common with cheaper grades of sandpaper. Or, where larger grit particles from previous passes with heavier grit papers have left larger loose bits of abrasive.

For the best results, the worked surfaces should be dusted off between changes to finer grit abrasives… and use good quality paper.