SCS - What can I do to prevent makeup from clumping with using this product?

I would recommend an exfoliation (simple as using a washcloth, cool water, and gently rubbing the skin, no product on). If we have a lot of buildup of dead skin cells, it prevents the product from absorbing correctly, so it most likely sits on the face, and not absorb into the skin. 

Since the serum contains hyaluronic acid, research suggests that you let the product fully absorb and dry into the skin (dermatologists recommend waiting 5-10 mins when starting a new routine with HA, the skin may need more time to absorb- it doesn’t mean this happens to all customers. 

If needed, you can use less of the serum, sometimes its about  trial and error since everyone has their own specific skin textures/moisture levels etc.I also suggest letting the moisturizer after the serum completely dry. 

Depending on the makeup used, it may be sticking/chunking because the foundation is trying to mix w the products instead of laying on top of them (trying a primer before laying the base foundation should help give a nice base for makeup to lay on.).