Sometimes its easy to forget the value of using a sanding block until we actually use one. They are especially useful when sanding finishes between coats or for wet-sanding because the surface of the paper remains flat. Using just your palm to back the paper can give you uneven pressure and spotty results.
Heres a neat sanding block design from
Brian Lowery. Just wrap quarter sheets of sandpaper around and tighten it up. Two dowel pins keep it aligned every time. Of course, you could just use a flat block of wood and hold it with your fingertips, but if you have a lot of sanding, that gets fatiguing.
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