I sprayed an adequate amount (probably more than necessary) of 3m Super 77 adhesive onto my 9"x12" granite block, and I basically attached about a 2" wide strip of each of 220, 400, 600 and 800 grit silicon carbide wet and dry around the perimeter using a j-roller. I have finer grits, but I was told "up to 800" would do the job, and a 9"x12"x2" granite block isn't all that big (it's darn heavy though!) I observed that the paper really needs to be on the perimeter of the block, to adequately sand the backs, so options are limited.
Starting with the 1/4" gouge, I did the *back* on all 4 grits using a circular motion. I "wisked" the sandpaper with a brush in between grits at least (to keep it "clean").
Then starting back with the 220 grit, I carefully ground the bevel side. I used a couple fingers over the bevel to apply uniform force as I ground/pulled it. Then I did the back on the 220. Next I proceded to the 400 and did both of these steps again--ditto on the 600 and 800. And for good measure, I ran both sides across my honing strop (both sides).
The 1/4" gouge was sharp--cuts hair, and cuts end-grain. That was my "benchmark" test. I tried my gouges on end grain before and after being sharpened.
Then I repeated the same operations to my 3/8" gouge, also getting pretty good results.
I was concerned my paper may have been worn out at that point (I compared it to nice fresh sandpaper), but I gave it a "bath" and it seemed to recover a little, maybe. It definitely had some smoothe spots.
I sharpened my 1/2" gouge the same as the other too. I don't think I ground all of the major scratches out of the bevel, but it was sharp after I was done. I think my 220 grit was too worn. ------------
Almost 2 hours elapsed since I started. I pulled the paper off of the granite, and the glue was still plenty sticky. Directions online said to use a razor blade next, but glue was too sticky/messy. First I used acetone on a paper towel, and then (upgraded to using it) on a rag, trying to avoid breathing the vapors.
Is it true, that the paper will only last for 2 small gouges? On my next try I was thinking of trying water instead of glue, and beginning with 120 grit.
I can see that my other larger gouges, which I haven't used yet are "rough" (at least I know the difference now!) I will work on them next, before I move on to some planes.
Please feel free to validate or criticise my approach--that's why I posted it! I have more sharpening ahead of me.