You can definitely scale this recipe up, but I wouldn't go as high as 32 ounces. For one, oils have a tendency to go bad after a while, and you don't want to apply rancid oils to your brows. Secondly, dipping a brush in oils (or any cosmetics, for that matter) introduces bacteria, which you then run the risk of getting in your eyes.u003cbr/u003eIf you plan to use this recipe as a scalp oil, you can scale it up as follows:u003cbr/u003e-1/2 cup castor oilu003cbr/u003e-1/2 cup argan oilu003cbr/u003e-2 teaspoons vitamin E oil (approx. 10–15 capsules)u003cbr/u003e-25 drops rosemary essential oilu003cbr/u003e-25 drops coffee essential oil