Sanding Squiggles

If you own a palm finishing sander you've probably experienced the shocked feeling to see dark squiggles appear in the wood's surface as you wipe on the stain. This is caused by using a grade of sandpaper that's too course for finishing sanding. It's best to use a finer grade of sandpaper such as 220 grit and save the rough paper for the belt sander or painted projects.