Resin to Oil Ratio for the Infused Oil: How much resin and oil you use, will depend on how much resin you’ve collected, and how strong you want your oil to be. For most skincare applications, you can use roughly 3 to 4 times as much oil as crushed resin. That would equate to 1 tablespoon resin for about 1/4 cup of oil. (If you don't have enough resin, use a higher ratio, such as 1/2 tablespoon resin for 1/4 cup of oil.)