To answer for Outback, just pour a little water on to a flat piece of glass, steel etc, put on wet n dry and the suction created will hold it in place well.
Yeah, no bother, just make sure the whole of the sheet is covered, you don't need to press down hard, let the grit do the work.
Do you wet the sandpaper on top as well? Or it soaks through sufficiently? I feel like if you wet it on both sides it would increase the friction on top and move around a lot. I guess the bigger sheet you use the less likely it will move, I'm imagining it in my head as a strip just wide enough for my stone, that would definitely slip around.
For lapping a stone you want a full sheet. Need to be able to do figure 8s. With lots of water, both sides and soak the sheet first. Water is the lubricant, things get sticky as the water gets absorbed so reapply via squirt bottle. Drop or two of dish soap he;ps with the slip as well.
And do not bear down, let the grit do the work..
Cheers.
SIC powder and a glazed floor tile. It's cheap and works better than any other method I've tried for flattening and I'm one of those weirdos who sees rock in the wild and says, "Hmmm. I bet I could hone a razor on that." Although the wet/dry I use for smoothing the stones. For instance, my soft Arkansas stones I will use up to 200 SIC on one side then 200 w/d on the other and it gives you two different surfaces to hone on. Even though it is the same grit the w/d gives a smoother finish....
Attachment 347648