There is one location where the cowling halves do not match to my satisfaction. I decided to fair the mismatch with an epoxy slurry. As this mismatch was small, this method should work fine.
Mix epoxy/flox/cabo and apply to mismatched area. Clear split line of excess epoxy with a dental pick. Next, I will split the cowling when the epoxy cures and finish sand the mismatched area.