if u used the solution i said, it will work. but yeah pistils will stop forming and die off so thats u know if its working, it takes time for the sacs to form between the buds.14-21 days like a normal male would. basicly all female growth should be stopped, no new pistils should be forming. if u still see pistils forming then its not working.
aslong as there is enough silver content in what u spray the female will turn male. the only reason why it would fail is if your water is so diluted that the silver doesnt impact the plant enough.
Spray each week till u see the balls forming.
offcourse u would have seen faster results if u sprayed them before turning into flowering.
everyone fails at it the first time because the formula online is wrong and was the first testing done when moham ram publiced his results that sts could make a female male, at that time there was also a dude exe selling the stuff which started the whole search in sts.
the formula online was a basic test that wasnt optimal, many people in that thread had better results with stronger solution and didnt have succes with that recipe. For some reason the recipe got spread everywhere as the standard,
now many years later u can actually find the correct recipe on making sts from a company specialised in this stuff.