I have used MTG on my paint! I don't have pictures, but it seemed to work well. I used it every 3 days, and never covered his tail like it said- pasture horses would try to eat it.
Also, just keeping it clean and LOOSELY braided helps. I add Regis salon silk drops to their tails, and use a bit of showsheen in it. Gets expensive but all mine but the appy have AMAZING tails!
And remember- LOOSE braid!! it looks pretty tight now, keep it loose or else it will just pull out the hairs your trying to grow.