Product review (5 stars): I'm so happy because I couldn't find a rack online that fit ...
I used this on a white sink grate.  Sanded down the rust and coated the previously corroded area with this repair liquid.  In spots, the corrosion left dents.  Over days, I was able to use this liquid to rebuild and fill in the dents.  I'm so happy because I couldn't find a rack online that fit my round sink.  This saved the day!