CMC permeates cortex to enhance moisture retention and strength. Ceramide 2 will reinforce CMC between cells. Polyphenol (tannic aside) will bind to protein providing hair with body and strength that can resist chemical stressors.
CMC permeates cortex and between cuticles. CE makes preceding PPT solution hydrophobic (solid state) having it stay firmly inside hair. Massage hair well to have CE penetrate into hair (and you will see water emerging. The more hair is damaged the more water emerges.)