We just purchased a pine bookshelf and dresser for my son's bedroom. Both items were sanded but have no finish. I am staining both now and will be ready for the polyurethane soon. My first question... is any brand of polyurethane more durable? My next question is the overall process... I was planning on just one coat of stain then coating it with polyurethane. I've talked to a few people on the process and have received different opinions on how many coats of each to apply. One suggestion is stain, sand, stain again, sand, polyurethane, sand and then polyurethane again for final coat. This seems a bit repetitive. Should I sand after I am completed with staining? Any suggestions are appreciated.