1. Mesh discs are simply less robust at the periphery than fabric or paper backed discs. They also are not as tough on really rough boards or easing corners or if they hit a nail or screw.
2. That protection pad you linked is MANDATORY with mesh discs. So order some TODAY ! If you don¡¯t , you¡¯ll end up buying a new festool 125mm backer pad for your sander within a couple of hours use. Perhaps minutes depending on your project and technique. And most ft pads are around 50bucks.
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