Need help making my custom 3D printed SHERP RC, water proof.

[PicoNano]

Hello everyone;
My first post in any forum for at least 20 years!
I'm building a big SHERP (489mm length) using my 3D printer, powered by 4 x NEMA 17 steppers driving each wheel through a 3D printed 1:5 planetary gearbox.
I want to make it water proof (not sink) and was thinking of pouring something like grease or Vaseline to cover to the top of the motors. But the motors get hot and will make these material liquid. Will this molten grease leak out?
The 8mm smooth shaft that comes out of the chassis, has a tight fitting rubber washer/grommet made of bicycle inner tube punched out in a form of a waster with a 7mm hole, glued to the exterior chassis and should not leak, but it most likely will according to Murphy's law.
What's the best way you think I should proceed? Could also use a bilge pump (12V aquarium bump) if need be and forget about the rest. It'll sink if it loses power though!
Thanks for your help.

 

[majin]

thats freaking so cool

 

[Lucifur10]

Will it actually sink if the wheels and tires are sealed? I would think those tires will provide flotation but make sure your chassis is balanced weight wise. Not all the weight on one side.

 

[PicoNano]

The wheels and body are printed in PETG and the tiers in TPU.
None of which are water proof. The PETG is easy to water proof with a epoxy paint, but the tiers will soak up water.
Since it's a scale model of the real thing, it should float even better, being in plastic.