I use this to tame the finer flyaway frizz that has started to grow at my temples. My hair is abundant but fine, with shoulder length layers and a slight wave. But, this one area of hair is getting thinner and straw-like, so it gets tangled very easily and tends to stick out straight instead of flowing neatly into to the wavy hair around it. I use 2 or 3 light sprays to the bottom half of the hair in this area on each side (not too close to my head or the hair gets heavy & flat). Then, I use a hairdryer and round brush and it smooths right into the hair around it, so my hair looks almost as good as it did 10 years ago.
I also use the TRESemmé Thermal Creations Hair Spray, which sprays on in a finer mist than this, smells a bit better, and seals the hair cuticle so it's shinier after drying/curling. But, I still like this Keratin Smooth Heat Protect Spray for preventing/taming flyaway frizz and tangles. Bottle lasts forever, too.