Feed your horse cod liver oil
I used to try every product under the sun but in the end it came down to feed. You can have an amazing looking horse without products if the feed is right
Coconut oil to repair for
Rice bran in the feed show sheen spray but a nice coat is obtained in the feed room imo
I use Vetrolin White N' Bright. Not only is it good for white horses, but it's great for colored horses as well because it enhances the natural highlights in your horses coat and it makes my mare look stunning. For her mane and tail I use Mane N' Tail shampoo/conditioner. It keeps her mane and the white parts of her tail clean and helps it grow.
I really like the quality of the Effol products.
I don't really know if these products can be really considered "repairing", but as far products for a horse's coat goes, I love the brand Shapley's. I love their entire lineup, they're all I use, and my horses are always happy, healthy, and shiny :) hope that helps!