As long as the lid is closed, the manufacturer says it will last forever. I restore Edison players, many of which are cast iron. This sticks to the metal of the pot and allows me to do light and strong cold repairs. I drilled and tapped the 1-64 screws that need to be moved. I did a repair when the top tab holding the .0270 steel pin broke, it worked and saved me $200. Before discovering this, I was using an expensive $50 product that works better with a lot less waste. Clean the stains first and it will stick.
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