In the near future I am going to be building a pond/hydroponics system, because everything in my garden is square, I was just going to dig a large hole, build a rectangle out of concrete blocks and then fill in around it with a concrete base, then I would use something to line it, tarp would be decent but doesn't look very nice having large crinkles and folds in the corner, so the spray polymer urethane? Would be a good option, but its really expensive, then there's flex seal liquid, the ads look great, but whenever I watch something another review on it, they always try to pick it down, like a news team repairing a boat with it then complaining that a small leak formed after 2 hours, so does it actually work? Is it none toxic when it dries? Wow that was a ramble. via /r/DIY http://ift.tt/2i9ETu8
