many growers do not full your sprayed at all during flowering for fear of mold but I personally do as I live in the desert where the humidity is about 20 constantly and mold is not as much as a factor. so to answer your question I guess it depends on how hot and how humid it is where your growing
I haven't foliar sprayed for a couple years just to spray… I don't see the difference, I do sometimes hit things with Forbid in early veg, or E20 (actually have not had to use E20 for 2 years *knock on wood*)
many growers do not full your sprayed at all during flowering for fear of mold but I personally do as I live in the desert where the humidity is about 20 constantly and mold is not as much as a factor. so to answer your question I guess it depends on how hot and how humid it is where your growing