Hhhmmm...I've never tried mousse before. Does it usually contain water? I wouldn't want it to revert to my press....
It does usually contain water...but I'm talking about using the barest, barest bit...not enough to actually wet or revert your hair, but just enough so that when it dries in the curler your curl stays.
On my own hair, I put my hair in a very high ponytail, put a tad of mousse on my ponytail and then roll it into a giant pincurl and pin under. The next day, I have a giant spiral curl which when styled, produces uniformly curly ends.
Try it when you don't have anywhere to go the next day or just before you are going to get your hair re-pressed and see if it works for you! I would also finger comb only after you unroll.