Finding Sanding Scratches
Although this is technically about flooring, it's a problem that woodworkers face and I know some pretty smart folks hang out in this section...
I've been slowing working on refinishing a small area (~50 sq. ft) of strip, red oak floor. SWMBO has decided on a fairly dark stain so I need to be pretty darned careful with sanding. When I've sanded furniture I've used tricks like looking at the surface at a low angle with a back light or wiping it down with mineral spirits. With a floor it's hard to get my head low enough and I really don't want to be using flammable chemicals in the house.