Thanks a whole heap mate. Here's a visual of my issue. The one on the left is uv mapped before smoothing and the one on the right is uv mapped after smoothing. I like uv mapping before smoothing because it allows me to go back to my low poly version and still retain a normal looking texture. The bad thing is that when I smooth, it creates an ugly seam and I can't find an option that prevents that during the smooth action.

Uv mapping after smoothing seems better but I'd rather do things the industry standard way. If it's still better to map a glass before smoothing, is there some option or trick I can do to prevent that nasty seam?