I used this treatment on damp hair after shampooing.  Just a few drops is all that's needed for my below shoulder length hair.  It defrizzes and acts as a heat protectant because it contains a lot of silicone.  I then use my regular styling products on top of it.  I didn't get any frizz, even in the Florida humidity.  It worked like a charm.  I'm impressed with this product and may decide to make it a regular part of my routine.  I definitely recommend it.