Make sure your hair is saturated in the gelatin mix.
For intense treatment: Place shower cap or plastic wrap over hair and wait for 30 minutes before washing and conditioning hair.
This hair mask makes enough to cover just below the shoulder hair length and would probably be enough for slightly longer hair. If your hair is short then 1/2 a cup of the mixture should be plenty. If your hair is particularly thick you may want to make a double batch. This mask lasts well as it will just set like a jelly/jello. I keep mine in a glass jar and whatever is left over can be gently heated and used again.
Coconut Oil Post - Gelatin Protein Hair Mask https://coconutoilpost.com/coconut-oil-uses/hair-care/gelatin-protein-hair-mask/