I have two rough cutting wood rasps.
They are like files for wood. Much tougher than sureforms.
One with four cutting surfaces, curved one side, maybe 8 " long and another maybe 12" with a plastic handle, curved one side and even rougher cutting. These two are very helpful knocking down runs and rough edges.
Avoid power sanding or grinding as you want to keep control and only remove the runs. Then sand and recoat the area with the same mix. ---Same mix for me because I often use different hardeners on the inside and outside...ie: 206/207/205 (west)