Don't know if anyone else has seen or used these. I found some "nail buffers" in my local pound shop. There are four grades of abrasives on the sides of a reasonably firm foam block. They go from what feels like v. fine wet and dry, down to flour paper. When cut into four pieces you get four tirangular sanding blocks, each with a finer abrasive than the last. Also each is coloured and has a printed label saying which is which. You get four blocks in each pack, so four of each grade on its own foam block, for just a pound. I've been using it on my current build and have very happy with results.
Hope this is of some help.
Tony
Hope this is of some help.
Tony
Comment