To conclude the moisture bumper issue, I will just quickly summarise the key points from the research presented over the last 3 weeks.
1. Water on its own is NOT moisturising. This is because it can enter and leave as it pleases (details here)
2. Oil layers on hair can help moisturise hair by retarding or slowing down the loss of water. (details here)
3. Humectants can help moisturise hair by increasing the amount of water present in and around hair (details here and here)
4. Hydrolysed protein can help moisturise hair as the protein adsorbs and penetrates hair and absorbs water increasing the moisture level of the hair (details here)
From the questions you asked we learned
1. You can combine any or all of the above to increase moisture levels. You do not have to use just one method.
2. Oil mixtures are good (details here)
3. Oils do not fully prevent water from entering hair. They just slow down its entry
4. I featured glycerin as a humectant because it is well researched but other humectants like aloe vera and honey may work just as well.
Alright, I consider the moisture bumper issue all wrapped up. As always do read the comments on the posts as they are always insightful!