My current line of work gives me access to some good sized timber in the round. I get hold of the more interesting pieces or larger lumps. I don't turn but seems a waste to not use them so how would a large logs be best prepared for future turning. Just got hold of some 12" diameter laburnum and don't want to mess it up for future use for someone. At present I just cut the logs along there length so end up with half moon shaped sections and coat them in PVA. Is this OK?