This is a subject that I'm very in tune with, I sell sandpaper for a living for Mirka.
Both PSA and grip have pros and cons.
In general, I prefer grip for most applications.
so 3m is your competition...
have they changed things?
Yes, I'm actively targeting several pieces of 3M business in car plants.
Not that I'm aware of.
Though it could be a bad batch possibly in that the hook/loop was not fluffed up and laid over flat causing not much grab between backup pad and disc.
If you're using a lot of grip backed discs, consider using a pad saver.
