Yes!

I used this spray when I was a teenager, and I decided to use it again as an adult.

My hair is untreated, wavy, thick, dry type, and naturally dirty blonde.

I realized that after cutting my hair, most of my blonder locks were cut. I looked light brown.
I used this spray as directed, blow dried my hair, and THERE WE GO! My blondeness came back!

I will probably be using this again at some point. But be careful with it! Because it's a chemical, it can damage your hair. Use it as little as you can. I don't recommend it for people who have hair that has been treated in the past. I take good care of my natural hair, so spraying a product like this in it every now and then doesn't hurt it.