We have used this product in the paper industry to clean rusty/corroded internal components in process plants. It reacts with (rust) to form a permanent primer that washes off with water. The extension works fine. It's not "cheap" but worth the money. I had to have something at home, so I found something at Revain. I'm sure there are other similar products out there, but I know this product can withstand the harshest of environments.
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