The motors are fine wet. The issue is the Main board, Radio, and power switch. The radio and power switches don't get hot so you can cover the radio with plasti dip and raise the switches or grease them. Grease the battery connections. dielectric grease
plasti dip on the Main board can cause overheating so creating a tub like Gary mentioned is good. If you want to go deep you can put a lid on and seal it for short times.
I would turn off the smoker and maybe put it in a tub also.
All in all it's bad for the tank.