Schluter Kerdi 323 Sq. ft. Roll Waterproofing Membrane

I bought the supplies to redo a bathroom back in November and due to circumstances beyond by control am just now getting to it. This stuff is horrible. Was trying to install over cement board and Kerdi insists on unmodified thin set. Well, it sets before you can even get a small section up even after heavy wetting. I was able to get a couple of small sections up, but they didnt stick. According to Kerdi, they have a special thin set that is guaranteed to work..... at a cost of $56 per 50 pound bag. It was less expensive to simply go buy RedGard than to buy all the extra thin set and not have to deal with this anymore. This was almost $400 down the drain as I was unable to return it. So unless you just like cursing and wasting time and money, just go get RedGard and be done with it.