I have seen some DIY cinder block pools even on this forum which have the obvious cost advantage over gunite. But then it seems like those same block pools are always either lined with vinyl or tiled in order to waterproof the structure. So here is my question. Why can't block construction be waterproofed in the same like manner, with the same plaster coating (which is actually a masonary material) that they use with gunite construction? Seems to me like you would have a cost advantage over gunite yet ending up having the same quality finish as gunite construction.
Why is this not ever done? Or if it has been done, where would I find an example of this on the internet?