I LOVE this stuff. I have bad luck with straight oils, and there was a thread on the old LHC where the idea came up that damaged (i.e. protein deficient hair) may not be able to grab oils well. Shea, being an emollient, helps upraised cuticles lay down, so this worked when nothing else did on my tattered ends.
Sniped from my journal, here's my recipe and prep method:
Leave-Ins: After a shower I use Fox's Shea Butter leave in, which is 1 part coconut oil, 2 parts conditioner, and 2 parts shea. I use Frank & Myrrh Shea because I love the smell, and my Jason Henna-Hi Lights conditioner. To make it I add the shea to a glass bowl in the sink, surrounding it with hot hot water and mash with a spatula until it's melted, replenishing the hot water as often as necessary to keep the glass hot. Then I add in the coconut oil (it has a lower melting point, so it blends into the shea quickly. Then I take out the bowl, dry it off and add the conditioner and blend with a hand mixer. To make it set faster and keep it from getting grainy I put it in the freezer for a minute or two, take it out and hit it with the hand mixer again. Repeat until it's the consistency of frosting and well blended. Once its done I transfer it into a glass jar and put it in the bathroom. To apply I scrape up about two peas worth and smooth it between my palms, then start at the ends, smoothing them, working higher up as there is less and less shea on my hands.