Fray-Check is a miracle liquid!
It's a clear watery liquid that binds the threads of fabric together to prevent fraying. It works wonders especially on thin quilting cottons and those notorious satin fabrics. I don't think I could stand sewing in 1/6th scale if not for the stuff.
It's made by Dritz, so Fray-Check is the brand name when you search for it.
It has a slight alcohol-y smell (rubbing, not beer) and will turn the material a slightly darker shade where you put it, though it's not terribly noticeable even if it seeps through the seams and onto the visible material. It doesn't wash out in water, though that does seem to make it less noticeable.
The best way that I've found to use it is to run a thin line around the edges of my pattern pieces before I've even cut them out. After I'm done sewing, when I cut back my seam allowances, I put some more Fray-Check around the seams.
Fabri-Tac is really too thick to do the same job as Fray-Check, where it is actually a glue, but I have watered it down before when I was in a pinch and out of Fray-Check. The results aren't near as consistent, however, and not near as neat or clean. I can't recommend Fray-Check near enough.
Do you have a near-by Wal-Mart, WhiteDove01s? That's where I get mine. I tried to check their website for you, but my internet connection has been bad lately and I can't tell if they offer it online. The page won't fully load. XD I hate dial-up! Anyways, I hope this helps some!