I've only used the Goop stuff once, but it was amazing on my pony's white tail. Sad to see it wasn't as successful for you.
Duren used a knock-off, which could be the problem. Yes, it may have the same ingredients, but not necessarily in the same portions, which can make a difference. A lot of times the original formula is protected by patents, so when knock-off brands are made, they can't use the exact same formula. So, they change a few minor things and then they can sell it. Unfortunately, those few minor changes can affect the way the product performs. This is the same reason why a lot of off brand foods don't taste quite as good as the name brand equivalent. Posted via Mobile Device