Sanding small flat surfaces so they stay flat
I'm trying to sand fairly small wooden objects that are about 1/2"x1" and sometimes a little larger. I often find that one side is thicker than the other or the corners are no longer perpendicular.
I am trying various techniques, like taking a chunk of 2x4 and wrapping it sandpaper and then vice it to my workbench. Then I rub the object against the paper block. That is getting better results.
I've read that some people use spray-on adhesive to secure sheets of sandpaper to a granite top and that it is supposed to work well.
There are a few instructables that explicitly talk about sanding and I've read many of them. They advocate a bunch of techniques.
I'm wondering what other folks have had success with.