I have already sealed the ends with PVA.
I have a chainsaw and a bandsaw but that is only 4 inches deep. I was asked some time ago for a very large bowl so I think I will cut a 3.5 inch thick slab so that I can cut a good round blank on the bandsaw, trying to get everything as evenly balanced as possible before I put it on the lathe.
I have a Perform CCL which when I turn the headstock to make anything larger than 12 inch dia will vibrate very badly until I get the piece balanced.
Another thing I have considered is cutting down the bed bars of my old Record Lathe and fitting the headstock so that it goes on the end of my bench to make a simple bowl lathe. The only thing I need to do is work out the best way to mount my tool rest. Possibly free standing on a car wheel filled with concrete.