Though it appears to be a gentle means of getting that perfect finish, over-sanding can quite literally remove the protective coatings on the wood, leaving it vulnerable to moisture and warping.
Uneven sanding will generally be caused by incorrect technique or lack of detail, resulting in unattractive patches and irregular surfaces.
One error is the use of a sander which is not appropriate to the task; for example, the use of a heavy duty drum sander on sensitive hardwood that will take away too much in one pass, leaving dips and valleys.
Another important factor is uneven pressure used in sanding. Most beginning sanders naturally rely too much on the machine, cutting deeper in some spots.
Practice keeping an even, consistent pressure during the procedure. Additionally, sanding direction is important; always sand with the grain of the wood.
Floor Sanding CroydonThis not only reduces the appearance of scratches but also assists in bringing a more even finish, rewarding your efforts with a stunningly smooth surface.
The single most underrated part of sanding floors is doing the vital test staining or testing finishes before actually applying it throughout.