Hi, I have a 6 x 2 x 2 galvanize steel tank. I filled it up with water and immediately began to leak. My question is can I use flex seal to coat the entire inside of the tank. Fixing the leak, and also protecting the inside of the tank from rusting. It says it is non-toxic, so I assume that means it will be fine with fish. Do I have to prep the galvanize steel so the flex seal will adhere to It and not peel off later? I attached a picture of my steel tank which is painted in a copper color on the outside.
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