I use MTG weekly, and braid my boy's mane and tail.
However, MTG does stink, and also makes his mane exceptionally dirty (it's white, so it stains it yellow-ish, and attracts a lot of dirt). I just use the MTG on the base of the tail, as well as his mane, I don't pull it through. I then alternate weekly between a spray in conditioner (without silicone in it), or coconut oil (super cheap - find it in your cooking aisle, it's a miracle product), throughout the mane and tail, and braid them both.
I've been doing this for about 6 weeks now I think, and i've already seen about an inch to a half an inch, a lot of top-growth too, and way less brittle and breakage.
... I would imagine the Vaseline would also make the mane exceptionally dirty and prone to attracting all sorts of dust and debris haha.