Originally Posted by StevenSmith
Thanks again for the replies. Is there anything to his argument that a final sanding of a grit finer than 60 will close the pores so the stain and polyurethan won't penetrate into the wood? What about his claim that his method results in a more durable finish?
No truth at all. To quote someone else, "lazy hack"
I make my living sanding hardwood floors. I'm primarily an oil base poly guy. Here's my process. Drum sand down to no less than 80 grit. Stain, varnish allow to dry over night. Sandscreen with 120 grit sand screen. Vaccum, tack dust with mineral spirit wet rag, apply second coat. Repeat between 2nd & 3rd coat.
If using waterborne, don't use a sandscreen on a buffer between coats or you'll see swirl scratches through finish. 3 coats minimum, preferably 4.
If you want to try to salvage the floors without resanding, you first need to get them relatively smooth again. Go to the local rental yard & rent a vibrating sander with 120 or 150 grit sand screen. Don't get totally carried away on the first sanding or you'll sand through the stain. Once semi smooth,vaccum & tack with water wet tack rag. Apply a coat of waterborne finish, being sure to always keep a wet edge. Once dry, sand again with the sander & repeat the previous finishing steps. Once dry, if it's smooth, tack & finish again.
You're probably not going to get the perfect floor this way, but if he done a decent job down to 60 grit, you can probably salvage it & let the finish do most of the smoothing for you.