i start spraying 1 to 2 weeks b4 flip..then another week er 10 days after flip...usually i try to spray em 2x a day but then sometimes i only doit 1x a day..kinda depends on how lazy i am that day...i keep watch on the pods to see when they ready to drop pollen and then i take pollen and dust the buds i want seeds on..i use some tweezers to pull pods off if they only opening one here an there...can use a pc of glass or mirror ect to put pollen on too an use a Q tip ot lil artist brush to move the pollen,,if the plants are small enuff u can just shake the limbs with pollen on over other plants limbs ect to dust pollen...lotta diff ways..i have several of those dark green/black welders glass lens to put pollen on....GL
chas420 pretty much covers the bases on it. if you are trying to just make the same strain you can just spray a couple branches and let it pollenate itself to. just make sure its in its own grow space.
Just to be clear, you dont spray a bud and get seeds, you spray a node and when those branches start to flower it will make "male" flowers that produce female pollen. Dont smoke any buds or parts of the plant that get CS on them either, since you can drink the stuff right out of the bottle the dangers of smoking weed with CS may be one of those weed myths, bro science kind of things but why risk it.
Twice a day is not needed at all, I have tested it out and once a day is plenty as long as the CS your using is over 50ppm.
And when using the spray it's important to know what it's doing... it's not stressing the plant out to turn it male, what it is doing.... is the silver particles are so fine that when the plant is sprayed they actually travel into the cells of the plant itself and the silver is binding with the ethylene hormone in the plant which tells it that it is a female. The rosin is safe though and it can be pressed off the bud, silver free.