Like Buffy Pads, the grit-impregnated nylon fibers of these filament cup brushes find their way into the irregular contours of logs to prep wood very effectively.
The 80-grit version is usually best, and can be found in both the 4² and 6² size. The 6² size stresses the bearings of a grinder more than the 4², but works faster.
If used for an entire log home, can take 1-3 Brushes for an average sized log home. These Brushes screw onto a grinder arbor of 5/8²X11. They work well to remove old coatings and weathered wood.
They leave a bit more texture in smooth (but weathered) wood than Buffy Pads, and can be used to reduce some cob-blasting texture and power-washing felting.
Heavier than Buffy Pads, and lead to more fatigue.