m0useanswered grow question 2 months ago STS works better and needs less applications from what I have seen, can be pricier initially, but I have only ever used CS.
I reversed a plant with a 10PPM concentration of CS, I sprayed it 4 times a day for a week and a bit, I did it to one branch on one plant, had it sealed off in a bag, it reversed the branch and I made lots of seeds onto itself and its sister plant.
The CS i used was from Amazon and did the trick but it was a lot of extra work as it was a week solution. Some have concentrations of 30-100PPM and they work better but needs to be tested, PPM pen does not register CS right so don't use it to check PPM. Can spray once a day for stronger solutions like 50+ppm
Knowing what I know now, I would use STS as its much easier to use but work with what you can afford and whats available. Stop spraying once pollen sacks fully form and if your useing higher concentrations don't apply as frequently. Pollen will get everywhere so unless you want all the plants pollinated in the tent be careful and keep it separated. You also can spray a lower branch and not the main cola, Its best to reverse plant A and then pollinate plant B to help prevent to excess inbreeding and retardation.
I'd also stagger the donor plant "giver of pollen/reversed male" 2-3 weeks behind the plants you intend to pollinate. this way the receivers "plants getting pollinated and producing seeds" will be fully grown in flower with lots of sites to grow seeds. Will only need one application to get it all done in one step vs repollinating new growth. Give the seeds 4-5 weeks to fully develop. I will let them go till the plant dies and they are very viable from my experience.
in simple terms:
Auto crossed with Autos = Auto Flower,
Auto crossed with Photo = Fast Flower Photoperiod,
Photo crossed with Photo = Photoperiod,
Fast Flower crossed with Auto = mix of Auto Flowers and Fast Flower Photoperiods.
Fast Flower crossed with Photo = mix of Photoperiod and weird Photoperiod with some auto genetics but not expressed.
gets tricky with lineages of plants that you don't know or that are not documented well.
Good Luck!