i have run through puddles to the point it starts sputtering. i have one body that has a hole cut in the windshield and one that doesn't. i recommend using a hole when its warm outside and you need some cooling over the motor esc and batts. When its wet keep things from soaking the inside.

All that said i have sprayed off the ESC and motors many times after some very muddy runs on the track then cleaned it up immediately with the air gun and have had no troubles whatsoever.

If you dont submerge and keep a body on the truck and you blow it out then finish with some wd-40 to drive out the remaining moisture things will be fine.