Exodus,
That isn't a method that the home grower should bother messing with.
If you treat a plant with GA, you can't smoke ANY part of it. Or make hash... or cook... you have to throw it away.
Your average hobby grower should stick to other methods of forcing hermaphrodite parts. Reliable ones include messing with the photoperiod, heat stressing yoru plants, and letting them over-ripen by a couple weeks.

If you know what you are doing and don't intend to use a GA-reversed plant for anything other than a source of pollen, you will see for sure when it grows male parts and it will look like any other hermaphrodite.

Seriously though, stressing with photoperiod is safest... put a cou0ple layers of paper bag over a branch and take it off sometimes... shine a bright flashlight up in there during the dark time once in a while... take it off and put it back on again whenever you think of it during the light time... just really mess with it.