I am pretty sure the PVC he is using is different from the PVC I machine. Next time you stop by G. I can show you sold stuff up to 12" dia. The stuff he is using is material that is much more porous than the the pure stuff i use and the stuff they extrude into plumbing products. I could be wrong but I have made plugs out of the stock we use and it weighs a ton. You can buy it any dia. you want and there is no need for gluing pieces together but the weight would be a major issue. I think he is using that stuff they make trim boards out of for the housing industry and it is a much lighter product. Probably the percentage of PVC in it is lower or they inject air into it when they make it or use just a certain percentage of PVC along with something else to keep the cost down maybe. I am not sure but this is me speculating. I just feel it is not the same product. But I could be wrong.
That is why they probably don't just use PVC cement. I also can't see paint sticking to the product I use either very well and his sticks good which also makes me think they are not the same animal.