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Here's what makes me nervous. After three days, the insulating layer seemed to still be a bit on the soft side. It could be the water retention qualities of vermiculite...or the thickness of the entire lab curing ever so slowly. The consistency of the vermiculite portion of the slab is sort of like clay prior to being fired. Nonetheless, I was concerned that I screwed something up, although I have read in forums that the mix never hardens like normal concrete. I guess only time will tell. Ho bisogno di pazienza. Pazienza e una virtu. By the way, the picture on the right shows a bow in the slab...it must be an optical illusion from my phone's camera. Really...it can't be poor craftsmanship ;)
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