I have used Smashbox Photo Finish Primer with Dermaxyl Complex for over 4 years. My makeup stays put all day long without melting or absorbing into my very dry skin. That said, I have found that buying the travel size keeps the product fresher. The bigger tube will last FOREVER, and the product tends to get a bit funky after awhile. The travel size lasts me at least two months, and the product stays fresh. Recommend to anyone wanting to fight the signs of aging!