Oils that do not penetrate the hair (and are therefore suitable as hair sealers):
- Jojoba
- Sweet almond
- Apricot
- Grapeseed

Oils that do penetrate the hair shaft:
- Coconut
- Argan
- Olive
- Avocado
- Sunflower seed
- Palm
Originally Posted by Aqua_Lily
I've been using argan oil, because I had it left over from my flat-iron days! Looks like it's back to the store for me... thanks for this info!