That link goes to fibre disks for metal conditioning.
Use 2 inch Roloc sanding disks on an angle die grinder -
The coarse 60 grit clog up slower - follow up with a last pass of 100 grit or so for a final smoothing.
I hacked away a lot of the -10 cabin cover drainage lip for the McMaster seals and these work fine. They are cheap enough to simply throw away.
I do have some PermaGrit tools - the sanding block is good for finally finishing a straight edge, and the cutting disk works great, but so does the similar Dremel carbide cutting disc from your local hardware store.
Get good at sanding holding the die grinder in one hand and the vacuum nozzle in the other hand.