I had a frame that sat outside for years that I found and it was full of scaly rust on the underside. While there was only one tiny pin sized hole in the deck -near that known rot spot by the left side of handle (which I plugged up with Knead it), I ended up dicing it when found a better deck with a broken engine, because I knew more penatrative rust holes would develop sooner than later, with all the thick scale underneath. That tiny hole along with the scale, was the beginning of the end.