It is best to use oils that are for your porosity and only mix sealing oils into your routine when it comes after the hydration part. Therefore, anything before your conditioner and sealant steps must not contain sealing oils. This includes pre-poo, shampoo, protein treatment if before shampoo, moisture mask if before shampoo, scalp treatment if before shampoo and so on. Your conditioner and sealant steps can have a blend of both penetrating and sealing oils. However try to refrain from only using sealing oils for these steps, without using a penetrating oil alongside them as well. If you are looking to achieve certain benefits from a sealing oil, then you can blend a couple of drops of said sealing oil into your penetrating oil to use as a sealant. The amount of the penetrating oil should outweigh the amount of sealing oil.