^ I will add that I also use blue (or purple or whatever) on my grey horses very light silvery tail and haven't had a problem. I mean to change it regularly but don't (luckily haven't had a problem) and, depending on how well I do it, it stays for a month or two before it falls off on its own (if I haven't changed it by then).
I've never had a problem with it, and I squeeze it together pretty good. I did have one time that I couldn't rip it, or pull it off. I made a small little snip, and then I was able to rip it off...without damaging my horse's tail :)
I just bag Mitch's tail when he's in the paddock, with a satin lined tail bag that velcro's to his cover
He rubs his tail something chronic when he is travelling, it drives me nuts, getting to a show with a stunningly groomed tail(with his terribly thin haired genetics too).... AAaaaand bald spot right in the middle, not able to be covered by careful grooming.. Oooh it drives me crazy, the only tail wrap that leaves me with a full tail at the end of every trip is the Zilco padded tail wrap.. this one
Are you talking about wrapping to top of the tail or the bottom?
Bandages shouldn't be left on the top of the tail - just something to protect them when travelling and no longer
If you mean the bottom of the tail then I think I own everything on the market to try to keep my greys tail from getting peed on and turning yellow and nothing stayed on really well, the best method was probably braiding the tail and wrapping with the elasticated leg/tail bandages we use in the UK and putting a strip of wide duct tape along the top to stick it to the tail hairs.
I've never used vetwrap - I would want something that came off easily when I was riding