You probably want to use epoxy to get a glassy look. You can achieve that look with sally hansens but it takes a few coats. If you use epoxy get a wheel to turn the flies with, so they don't sag or turn one at a time in your vise till they set up. There are other substances that work also, like household goop thinned down. Even if you use epoxy or others it still can take more than one coat to get the result you discribe.
Have fun and good luck. Chad