Anne, are you using a metallic needle with the metallic thread? Also, you might want to reduce your tension to about 1 and slow down your machine so you can't go too fast. I find those things make a big difference to me when I use metallic thread.
Oh, just thought of a couple more things - if it's Gutterman thread then it's probably on a spool rather than a cone? Can you put the cone upright on your machine? That might help. Also, putting a cotton sock on it if you are using a cone on a cone threader would really help too.
Enjoy the show and don't spend it all in the one shop.
Wendy, I usually use a thin almost invisible thread on the back so that my stitching won't be so obvious. I think Bottom Line is great because it's really strong and doesn't stand out too much.