? for the tile guys out there, floor leveling

[no bait nate]

so this past week i was using Level-Quik Rapid Set floor leveler to raise a floor over some heating cables before we do carpet on a project. We ran a few bags short on the leveler so had to run and get more to fill in, and ended up with some rough edges. Does anyone know if these can be knocked down with a belt sander or a rub brick, or if this stuff is to hard. I was thinking that would be the easiest way, or else i may need to feather them out with some thin set. thanks