I had a horse with a very stubborn mane. I left it braided for days and it would be flopped over within an hour. The way that seemed to work best was to use hair get (Dippity Doo) not sure if they still make it... now they have Quickbraid and that is pretty good stuff. I get the product all in the mane and then braid it over. For a little extra and to help keep the braids, I use another rubber band and band 3 braids together. It seems to help overall. It just depends on the mane... some people can just brush the mane over with a wet brush and train it that way... alas I never been so lucky.