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It seems everyone is on the same page of this being efflorescence. I'm wondering if the salt is due to the years of salt seepage from road salt brought in by cars parked in the garage. If so, maybe this will get better over time. In the meantime, I'm going to try spot touch up when the...

Legacy - Thanks for the quick reply. I thought it might be something like moisture. I guess it leeches up through the concrete?

I painted my garage floor with Rustoleum EpoxyShield Garage Floor Coating in the summer of 2010. The floor was 20 to 25 years old by then and it was still bare concrete. I live in Wisconsin so the floor had been exposed to salt and melting snow as well as auto fluids. It was pitted in some...