Don't wash your brushes between coats!
I'll share with you soon what we were working on last week, but to give you a hint... it involved multiple coats of paint.
In general, I prefer to brush on paint as opposed to spraying. There are less fumes, even coats, and less of an overall mess. The one downfall is saving the brush from drying out in between coats.
Introducing: ziplock baggies! You could use plastic wrap if you prefer.
Place your paintbrush into the bag, squeeze as much of the air out as possible, and seal the top. This will keep your brush from drying out in between coats. I left my brush in there for 24 hours without consequence.