I seal with oil and what always worked for me was to add a few drop to my hands that my palms shine when I rub it together and smooth it down my hair.. I always start with the ends because it is usually the part that needs it the most and more is distributed there less than the roots, so that it'd be less oily. Sealing doesn't mean oiling your hair just adding a sheen.. Also, some oils are heavier than others. Like coconut and olive oil are heavier than sunflower and sweet almond oil. Coconut oil always made my air feel crunchy because of the cool weather here, so I can't use it. Olive oil works but tends to make my hair feel weighed down or oily, though it doesnt really look like it, but I like it because it may also condition hair for it's penetrative properties. Sweet almond oil is just perfect for me though.