When I got my first Festoy sander, I got a whole stack of different grits. I did not know the difference between the names on the packages. I don't really get much time in the shop, so I still have all of those different grits with different names. I discovered Granat, maybe a couple of years ago. I had been reading so much here on the FOG about the Granat. I needed something to really cut for a thray I was making where some of the strips had not lined up properly and I needed something to cut rapidly down to something close to flat. I was at my Norwalk toy store and rummaging thru the stack of discs for my RO 150 and noticed a 10 package of 40 grit Granat. I grabbed the package and ran. That stuff cut! And it LASTS. I was amazed.
I had a package of Rubin 80 grit in my stash that I used for the next step up in grits. That did a smoother job than the 40 grit Granat, but i did notice it did not cut as well after a few minutes. I now check every time I go in to that toy store for higher grits in small packages of Granat. I have not had much chane to use the higher grits yet, but do have a large table (large project for my small shop) where I expect to find out how the higher grits of Granat will work. I still have plenty of discs for the grits from 100 and higher, but will be out of rubin for the lower grits. I will know better the comparisons by the time I finish up in the spring. I have been cutting back on landscaping work and will be finding more time to pay with my toys and sand paper.
As soon as I get thru spending $$$'s on grass seed and fertilizer, I will by thinking seriously about my next toy, an RO 90 for some smaller jobs i have lined up for this winter projects (after the table)
Tinker