sorry I don’t know how to analyze the quality of waterproofing
(time will tell ?)
I bought this motor 4 weeks ago and tested it with different self made props. It is possible to efoil with the motor with my setup: 80kg Gong 85L Board 12S16Ah Battery and 1250cm² foil.
You only need a good ESC that will not overheat 
What is a little bit disappointing with this motor is the stainless steel bearing, as mine already has set up rust.
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I tested yesterday my 7070 to efoil with 12S3P molicel P42, motor at the bottom of my 75 cm mast, the same 3D printed guide, 45L surf foil board, it worked like a charm, really surprised how well it behaves.
Regarding rust, I don’t have any rust here, I think that the circlip rusted and the rust on the bearing comes from the circlip. I removed circlip a long time ago, to be able to remove the rotor and rinse it, and some lanolin spray ro prevent rust
Strange, I have a ceramic bearing on the side, and an inox on on the other side (the inox one does’nt have any rust after 20 sessions)
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