Stupid white tail...anyone ever see waterproof tail bags?

My filly's tail is just about long enough that she's going to start getting urine on it. I bought a braid-in tail bag but I'm thinking the urine is still going to get in and stain it. Any suggestions?

My trainer has a horse that is pure white and has a really long tail. She takes a long knee-sock, braids the tail, tucks it in. Maybe 2 socks? Sorry, not a whole lot of help here, thought I'd mention :/

I really don't think using the braid in tail bag will allow it to get stained. But I'm not 100% sure. You might just have to use it and find out.

I've never specifically seen a waterproof tail bag, but at the same time, I've never looked. I assume, though, that you could MAKE your tail bag waterproof. Waterproofing spray is generally $5-$10 and you can probably find it at Walmart. I found my bottle of it at a shoe store and I used it to waterproof my barn shoes. =)