Put show shine in it but wash it first
Put some baby oil on a cloth and wipe into the tail - start with just a little and add it slowly as if you use too much it can make the tail look greasy but it works really well if you get it right. Can also use it on mane/forelock, face and legs for a little extra shine.
Cowboy Magic! It's a little pricy, but it's amazing
Hot oil and then show sheen, you mix the hot oil with boiling water and then you add cold water to make it warm enough to use them you just sponge it onto the horses coat and tail and it works really well, you do this the night before and then use show sheen the next day and it will make a super shinny tail
Try coconut oil/conditioner and braid. Leave the braid in for a while (maybe a few days) and take it out, brush, possibly add more conditioner, and within a day or two it should start looking sleek and shiny 😊
i like spraying a ton of show sheen in my horse tail