The important thing to look for when buying that shine product is to make sure it contains silicone. That particular ingredient will do wonders to tame the frizz since it will cause the hair cuticle to lie flat instead of out of control.
What I like to do is to carry a small bottle of shine spray with me in my handbag. This simple preventive measure can do wonders to save your style from frizzing out when the humidity is on the rise.
You can opt to do the same thing with a shine serum that also happens to contain silicone. I just think it is easier to just put out my spray and shoot to whip my unruly hair back in place.
If you do prefer the serum form, I have a better way that you might want apply it. Try rubbing just a tiny bit of the product into your hand and fingertips before running your moistened hand over the surface of that frizzy hair to distribute the serum evenly. You might be surprised at how much better hair will be!