I am in the process of making my first brush handle. The wood is Bolivian Rosewood, I am down to the final sanding stage, but I am unsure as to what to use to protect the wood from water damage. I do not want to paint it or stain it, the wood has wonderful grain and color that I would like to preserve. I do not have a lathe, and I have many hours of sanding and shaping invested in this thing, I do not wish to see it swell and crack. Any advice from some of you experienced wood workers would be appreciated. Thanks.