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Given that you pour your own pan - lets not worry about the exact material but obviously it would be porous. Can you use a "waterproofing paint" to create your pan without any other waterproofing membrane?

This question Building on top of 3/4'' plywood subfloor touches on the topic. I have not personally done this but I am not sure I would be opposed to it. Given that Kerdi is selling at like 50 times cost to make and it is a long process to install correctly... Do we have the technology now to paint on our waterproofing? I am talking floor applications here.

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DMoore
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Redguard (tech sheet) passes the ANSI A118.10 and A118.12, which include waterproofing

Shower pans are a critical assembly and have to be treated as a system. Both Schluter (sheet membrane Kerdi) and Laticrete (liquid membrane Hydroban) use a wide flange drain assembly that improves the transition area between membrane and drain.

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