Hi Isabel! Make sure you are applying products in the correct order – liquids first, water based serums, followed by oils, etc. You may want to allow adequate time between applications to ensure you have given each product time to settle into the skin, rather than lay on the surface and ball up. You may also want to check whether your foundation is oil, silicone or water based. For example, in some cases, silicone based foundations may not play well with certain facial oils, so you may wish to skip oils in the morning and use them only in the evenings. I typically find 4-5 drops of oil is plenty for my skin type, but depending on your needs you might want to play around to see what is best for you. Remember, SPF is the last step in your routine. Hope this helps!