Although misting can be beneficial to your plant, because it helps them from drying out there are a few things to keep in mind.
1. You should always mist lightly, I recommend a spray bottle.
2. Mist/spray your plants right before you turn off your lights, otherwise the water can start to boil as it evaporates and seriously damage your leaves,
3. If you get any small amount of water on an HID it will explode so think about quickly misting your babies right outside of your grow room before the lights go out
4. You should only foliar feed when regular feeding would start. Do one or the other, not both; nute burn sucks. Foliar feeding is also a great way to rescue plants suffering from soil nutrient lock-out
Peace!