using fertilizer in the veg stage of growing is common, the trick is to use the correct type and quantity for foliar feeding....you are instructed to alternate reg water and foliar feeding, as this washes excess fertilizer off the leaves( leaves need to be clean for photosynthesis. You dont want to use to much or as a previous post says, you may damage plants leaves(chemical burns) One other thing about misting I'll add, if you use HPS lights or anything that sheds alot of heat you'll burn the leaves as well...in that case I would do it at the end of your light cycle. Foliar feeding is a way to get nutrients to your plant fast, most people reserve it for when there is a problem in need of help asap... stick to liquid fertilizer in your water dude.