There are a lot of things that work to seal it. Latex house paint, titebond II or III, some use shellac, there's a wax dip specifically made for the job. I use polyurethane. I have a gallon of it that I just dip the stave into. It does a good job sealing the wood and you can still see the rings under it later on when your picking a stave to work on. If you have a lot of ERC in your area, find the bigger trees that have good sized clean limbs. Use the top half of the limb. It will be much denser and stronger than the trunk wood. I've made several unbacked bows from the top of the limbs, but not one trunk wood stave has survived unbacked for me. Just my .02. Josh