This looks to be the best way I’ve seen of waterproofing RC Cars or Truck.
It’s done using Outerwear kit 20-2644. The video says that it’s only $10 but you can also find them for as much as $40 so you’ll have to do some shopping to find the $10 price tag. I’m thinking that they’re going to get popular pretty quick as they are easier to install than opening up your ESC and covering all the components in liquid tape. You can’t submerge your entire truck so waterproof might be the right word especially when you compare the setup to a waterproof RC truck from Traxxas. However for racing in the snow this is a great solution.