This step is for sealing in the moisture from the liquid. I use our Golden Hair Oil
for this because it is lightweight and makes my hair feel soft, smooth and shiny (plus we have bottles upon bottles at my house). While water and oil don't mix, some natural oils have the ability to penetrate the hair shaft, such as Coconut oil, Olive oil, and Avocado oil. This helps the hair to retain the water you applied, so is great for moisturising. I do like some other oils like Castor oil, Grapeseed oil, and Jojoba oil but these work better as sealants, so if you were to go L.C.O, these oils would work better as the final step. However, this might be perfect for you depending on your hair texture. It's all about trial and error.