For the last couple of years I've been experimenting with various sealers and glazes for my bottle cap pendants. Until now, the most promising products were UTEE and Diamond Glaze. I did a previous post on them in 2009 that you might want to refer to. I was never completely satisfied with either of these products for my purpose, but they were the best I tried. I wanted to use resin, but the toxicity of the product was not something I wanted to deal with. I've just discovered a very promising product that has been around at least a year called Magic-Glos by Lisa Pavelka. It's a one part liquid resin that is UV light cured. That means it will cure in minutes in direct sunlight! I tried the product on a few of my pendants and I'm very happy with the results. The final product cures crystal clear and looks like glass. It takes a little while to learn to use it properly, but there are directions and videos by Lisa on her site and on UTube.