Hello everyone, I want to thank you all for the amount of information that is in this forum. So I am doing an Owner build but I have been reading about the spa spill over as I have. So because I have this spa will I need to waterproof the interior and exterior of this spa? or interior and spillway? I am kind of confused on this as I never owned an inground before. Also I used the waterproof membrane from Home Depot before during a shower remodel, is that the same stuff and recommended?