How does the ToolClad prevent rust? We tested our covers by subjecting a table saw into a humidifed environment for 24 hours. In this rust test demonstration, the table saw was subjected to 88% humidity for 24 hours. It was amazing to see the table saw rust in such a short time, but you can see the section covered with a ToolClad was not affected! If you love your tools, this is the table saw cover for you!