I am working on my shower stall and just laid down my waterproofing membrane (TEC Crack and Waterproof Membrane). Problem is I didn't use a gauge to confirm the thickness of the membrane while wet. I used the flat edge of a 3/16" V trowel to apply and spread the membrane material across the walls for both applications (second was applied perpendicular to the first)
I used (2) buckets that "should" cover 50sqft each. The walls total area is approximately 60-62sqft.