"Just a quick question about the Red Pimento Oil do you recommended it before washing or can you mix with your leave in conditioner?"
Advice: From experience, it's best to use Strong Roots Red Pimento Oil before you shampoo your hair. Part your hair in sections, apply a small amount of the oil to your scalp. Massage it in for 2-5 mins (concentrating on the problem areas i.e. nape, temples, hairline etc.). Rinse, Shampoo & Deep Condition.
You can shampoo, t-shirt dry your hair (so it's no dripping wet), apply the Strong Roots Red Pimento Oil to your scalp in sections. Massage it in for 2-5 mins. Proceed to add your deep conditioner to the rest of your hair (focusing on your ends and hair shaft), avoiding your scalp.
Both methods should give you great results!
P.S. I wouldn't recommend you using this at a "leave-in" product, as it could possibly cause irritation to the scalp.