Brushless motors are incredible pieces of engineering, its amazing how little we have to maintain these things compared to brushed motors. To help extend the life of my new Flux Tork motor as well as reduce maintenance intervals, I'm gonna seal up the front endbells openings with some set screws. I asked Patrick del Castillo, president and principle Engineer of Castle Creations at the RCM forums about doing this last year. He stated that there should be no issues with sealing the endbell of the 2200kv motor up. Never hurts to double check when your dealing with a $200+ motor and asking the president of the company who designed the motor is about as good as you can get! Major Kudo's to Castle Creations for their help and support at RCM in dealing with customers questions and issues on a face to face basis.
I would ask them again