bathroom waterproofing

I am renovating our bathroom and up to the waterproofing stage, after reading posts on here and talking to people im thinking of using Ardex wpm001.After ringing around getting prices i was told by one shop that Ardex wpm155 is cheaper and a better product. My question is has anyone used this or what is the difference between the two, and what is the better product.The bathroom has been lined with villaboard and we are on a slab floor.Thanks in advance.


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