Concrete may be a little different than my understanding (I deal with oilwell cement for a living), but I would think that the sun could cause the water in the slurry to evaporate, leading to a less than ideal concrete at the surface of the pad. Cement has a specific water requirement for an ideal "set". Whether that would cause peeling or lumps, I don't know, but certainly I would have preferred to keep the sun off.
As for fixing the problem by grinding it, I can't see that being a problem to the cement itself. But it might not look that great!
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