Fray Check is great. The only problem with it is that it will wash out if you wash your gear.
I usually cut my ripstop or nylon with really sharp scissors and then immediately fuse the edges with flame (if I don't use the serger, instead). A bic lighter works well for this. Fusing it immediately doesn't allow time for the fabric to fray, except only barely, before I'm able to fuse the edges with fire. You have to use a delicate touch with flame, meaning you don't have to actually touch the edge of the fabric you are fusing with the actually flame. Just get close enough to the fabric to start to see it fusing. Practice with some throw away scraps to get the knack.
Hmmm.... this sounds like another perfect candidate for a video, me thinks.
My best to you on this.