Auto feminization/sts question

I'm starting an autoflower feminization project and I'm popping the seeds today. Ive read that with sts you need to spray a week or two before flower which with autos is a little hard to figure out because 2 weeks may be all it veggs for so im asking for some advice. Is sts the way to go, is there anyone who has feminized autoflowers before and has a different spray solution that they prefer to use? Do i start when it's a week old from sprout? Do i pop the doners a week or two before i pop the recievers? I'm familiar with breeding with regular photoperiod males but not feminized and definitely not autos. Any help or tips are appreciated thank you.
 
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