This particular tip is for hemming, but the stabilizer can help out anytime you have a flimsy fabric that is difficult to work with. Your fabric has to be washable.
I just made a dress with miles of chiffon flounces to hem, for which I used the rolled hem on my serger . In order to make hemming them easier (or even possible) I used a liquid fabric stabilizer (in my case I used Palmer Pletsch Perfect Sew).
After cutting out the flounces I spread them on a waterproof surface. Then I used a foam paint brush dipped in the stabilizer to dab at the edges (into about 1.5 inches from the edge) until they were wet with the stabilizer, and then let them dry (running a fan makes it go faster). In the past I have also just dipped whole pieces of yardage in stabilizer - makes it a dream to cut out! Another option is to put the stabilizer in a spray bottle.
It was SOOO much easier to hem the chiffon once it was stabilized. I used my washer to wash out the stabilizer afterwards, although if you had a small project you could rinse it out by hand.