I just purchased reclaimed wood barstools. If they are coated w/ a light varnish or poly, I can't tell. There's some natural splintering of the wood. I'm interested in coating the tops of the barstools with perhaps a polyurethane. I've read some of the posts and it appears as thought that's better and thicker than varnish. I want it to be clear, not really glossy, but I want it to seep into the cracks and really "cement" the splintering. I've sanded it, but I may not have sanded it w/ appropriate grade of sandpaper. I'm DIY-challenged, so I appreciate any informed feedback and ideas! *thank you*