I love working with "found wood" and have tried several methods to dry green wood. Rockler sells their "Green Wood Sealer" by the quart and the gallon. It works well, although there is still a small amount of checking. I now am turning the green wood into a rough shape (that may be just turning the bark off to make "naked" cylinders, or a rough shape for a spindle or bowl). I don't treat them at all, but seal each of them in a large brown paper bag, like you can still get at the grocery store. Some people have added sawdust to the bag, but I haven't found that necessary. The moisture in the wood slowly outgasses through the brown paper and over the course of several weeks the moisture in the wood slowly comes to approach that of the atmosphere in your shop. (Don't use plastic bags, as they don't allow the water vapor to pass through). I weigh the wood in the sealed bag on a postal scale initially, then every 1-2 weeks, and write the weight and date on the bag. As the moisture is lost, the weight of the bag-and-wood decreases. Once the weight has not changed for a couple of weeks, the moisture is at ambient and the wood is ready to finish turning. This has worked very well for me.