Wait, do you mean a primer on your skin? I haven't looked at the ingredients, but I would think that hair serum would make your skin shiny and slippery and makeup would slide around on it. The silicone face primers that I have used leave a matte, non-slippery finish. But, you've already bought the product, so why not try it out? Do a patch test on the inside of your elbow, and experiment with how your makeup goes on over it.
You probably wouldn't want it to run into your eyes.
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