I would avoid a waxy hair food type substance as it will cause build up on the scalp & scalp produces oil by itself. Water based oils are more helpful for nourishing the scalp as water based oils will evaporate throughout the day .
I would not recommend petroleum products on the scalp. So for scalp problems I would suggest you go to professional hairdresser or if it is serious a dermatologist will diagnose & prescribe a proper treatment.
It is important to keep scalp clean for optimal hair growth.