Go to Napa and get some Hi-Temp silicone. It works great for attaching heater pads to hydraulic tanks, transmission pans, oil pans etc. Clean the tank and loose pad well with something that won't hurt the tank or pad such as several doses of Simple Green.
When you apply it, don't apply too much so that it forms a layer between the tank and the pad. Use something to roll on the pad to force out the excess. Then if you can, use something like a s**** piece of plywood to keep the pad pressed to the tank while the silicone is drying. Let sit for 24 hours.
Bill
