With a half dozen goats, 40 chickens, and 5 turkeys there is always a demand for stock tanks. I have always had good luck with Rubbermaid structural foam stock tanks, as they won’t rust out like galvanized steel stock tanks. However, they are very difficult to repair. I have had a couple of 150 gallon tanks crack in the exact same spot (the curved area in the vicinity of the drain plug). I believe this is caused by ice expansion if they freeze solid (which will easily happen in a New Hampshire winter). I do have a 300 gallon Rubbermaid stock tank that has never cracked in 5 years of tough service. I think this is because I always keep a stock tank heater in it, and some of the smaller ones I don’t bother (hence the cracking). At any rate, the internet is full of ideas how to repair these. JB Weld is a popular choice, as well as trying to “weld” the plastic. I think Harbor Freight Tools has a plastic welding kit that some folks have used. I tried a repair with a propane torch (to melt the plastic around the crack) and a screwdriver (to smooth the molten plastic). This worked for awhile, but cracked again that same year. This time, I tried a fiberglass repair kit. Using a paint brush, some fiberglass resin and some fiberglass mat, I carefully coated both sides of the crack for a relatively easy repair. Actually my previous attempt at “welding” actually helped roughen the surface to give the fiberglass something to grab on to. So far, my repair is holding, but I have yet to fully test it. I will report back later to let you know how it is holding up.