We have been in our log home for 10 years and I’m happy to say have had no problems structurally or otherwise. When we built, I chose to leave the interior logs (8” milled pine) natural and put a coat of oil on them. I am now thinking about possibly putting a coat of varathane (what is the difference between varathane & urethane) to enhance the grain as well as make dusting the logs easier. Is this something you would recommend? Can I harm my logs by applying the varathane?