Well the mamba max IS waterproof, so you dont need to worry with that

And then motors, theres no way to seal them, you know the best ways, but you cant seal them up.... Just run it, and clean the bearings after so they dont rust and you will be fine

I dont have much experience with bigger motors, but I have ran the MM in POURING rain, and have raced many many times in the rain with novak, and orion sensored motors....