I used this on some fairly large rust spots in my driveway caused by a 30 year old trash can that was left in place for 5 months while I was renovating my house. The basic instructions are simple enough - say it. in a pump sprayer (wear appropriate personal protective equipment - whatever that means to you). For me, it's a pair of rubber gloves. Don't spray in the wind - it contains HF and this stuff eats into your bones in high concentrations. In any case, it snowed. I waited 10-15 minutes, all the stains stayed on the concrete. Sprayed a little more (used almost a gallon at the time), waited longer, nothing happened. Confused and realised, hey, it's only $10. I rinsed it off thoroughly with a hose. I went into the house, left the next morning, and the concrete was snow-white, almost like freshly poured concrete. Rust spots, even strong ones, have disappeared. So follow these steps: 1. Spray it on.2. Wait a while.3. Wash off.4. Come inside and have a beer.5. Come back and see if you notice a change.6. Repeat 4 and 5 until 6 is true - at that point you're either drunk or it worked. Win, win.
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