Hatching eggs- Do I need to spray them?

I never have and never will and always had a good hatch rate, remember hens in the wild don't carry around water sprayers and have still managed to keep the population going  .

I can just picture mama hen marching around the coop with the spray bottle under her wing.

 

You'll find that your broody has pulled out all of the feathers on her breast - that allows not only better heat distribution to the eggs but also allows the hen's sweat to keep the eggs moist. Depending on what time of day it is, sometimes the eggs can feel wet, other times bone dry. Your little broody knows what to do best, so just leave her to it!