I have never tried it, but from what i have seen they start it a bit later and just spray one branch that will be used if you dont wanna sacrifice the hole plant to the experiment.
And are you spraying both plants ?
But in my opinion you normally spray the one you want to hermie which polinate the other if you spray both they will both hermie and the result will most likely be hermie to a high percentage. I would sray one and leave the other full female.best of luck
No sign of any pollen sacks yet after 1 week of spraying the lower branches. It's normally during weeks 2 to 3 when pollen sacks appear.