Join Date: Oct 2007
Location: corvallis, Oregon
Interesting. No cabinet beneath it? Well anyway, that's actually a lot easier to do. I think we were mostly picturing a standard bathroom vanity with a long back edge, and maybe one or two sides in between walls. This is pretty small. Just hold it in place and measure the gap at the back. If it's 1/8", then mark it at 1/8" at the front edge. That's how much you need to take off there. Measure every 2" from the back and make corresponding marks from the front. It's not very much to take off, so you're probably just going to have to plane it. Or you could take some off with a jointer and finish with a block plane or sanding block.
I spray satin polyurethane, thinned 10%. Multiple light coats, dry 24 hours between coats, light sanding between coats. Not a completely matte finish, but it looks comparable to lacquer if you do a good job, not too glossy. You want to make sure that you do the drain hole, edges, and the bottom, too. So you want it to be completely ready to install before finishing, i.e. cutouts, faucet holes, etc. They all need to get the finish. I usually do 5-6 coats for this type of thing.