The entire surface isn't horribly rough, it is just has a few high spots, and up against the house it is very rough. Is there a way to just grind these spots? Perhaps a smaller tool? And what about the spot near the house? We aren't thrilled at the possibility of having it multi colored.
I ask for small tools because the only thing I found was this. Granted there are more places I could try but this was the 1st and the closest I've found thus far.