Protein sensitive heads usually react pretty negatively to straight coconut oil...you can try testing it on a small section if you'd like to try it though. It will definitely penetrate if you leave it on long enough, it can take from 6 to 14 hours depending on porosity/how much you apply.
I have very coarse strands and low porosity too, I personally can't use straight coconut oil but my hair is fine with it when it's formulated in a product.
Last relaxer: April 2, 2012 ... I'm Transitioning!
▪ Wiry texture ▪ SO pattern ▪ Sharpy-sized & pen-sized curls
▪ Coarse strands ▪ Normal porosity ▪ Normal elasticity ▪ High density
▪ Rhassoul clay
▪ Jane Carter Solutions Nutrient Replenishing Conditioner
▪ Komaza Care Califia Moisturizing Cream
▪ Yes to Carrots Shampoo