Spray the plants either at the first day of 12/12 or start before you turn to 12/12 . I start a week or 2 before turning 12/12 to make sure I get as many male flowers as possible. Twice a day morning and bight etc until pollen sacs are about to open. Never had a fem seed I've made go Hermie .I did a few things before work, cleaned out my spare tent out, put a shitty spare led in there got the fans going.... put the pineapple chunk and bubble kush in there, not going to switch 12/12 yet, going to wait until most of those clones have roots then throw in all the different ones.... so I think bob told me but can’t remember when to spray the plant, @bobqp or anyone who wants to contribute, give us your tips and tricks