i wouldnt think its to bad for the engine .. as for the electronics if you want to drive in snow or mud you have to waterproff your electronics even then dont do it unless your willing to lose your receiver or servos
It can be bad if u dont seal the electronics all u have to do is put some blue silicon and the cracks of the servo and the electrics. Just seal any place that water can get in.and WD 40 is a good thing to have just go over the truck and it will help keep water off.
I did the plasti dip thing too. After I did it in black I found out that they sell neon colors too. This stuff is really easy to work with, and the servos just happen to fit perfectly in the can.