I am making a wooden pendant out of an unfinished wood piece. I'm going to put the design on it and then cover the top with 3D crystal lacquer glaze. The problem is, what do I do about the back??

I don't know what I need to seal it with. Because it's wood, there are all kinds of moisture issues that have the potential to get really gross with constant use. I can't seem to find any books on the subject; and when I searched online everyone used something different.

I looked on a site for natural plug piercings and they used jojoba oil and carnauba wax. Some others used several coats of Krylon, water-based polyurethanes for bare wood, or nail polish.

I'm looking for something moisture- resistant that will not eventually rub off and that will not cause irritation on the skin.

What do you think is best to use??? I would really appreciate your input!