A customer at my shop in Dayton insisted I use a 3M sanding disc on his '67 Mustang's quarter panel, saying 'anything else is just wasting time'. | Auto Body Repairers - Freelance Forum - The Community for Independent Professionals
Yeah, that "anything else is wasting time" line is a classic. They're not wrong about 3M discs, but sometimes a different grit from another brand gets the job done just as well.