Meepoboards are water-resistant. Water resistant means that our boards won't let water in easily. So if you drive on a wet road your board should not break. But if you skate over puddles or even submerge your board into water there is a high likelihood that water will get to electric parts. It is also pretty dangerous when you are riding in rain, especially for accelerating, braking or turning.
If you accidently ride in the rain or on wet surfaces, wipe off all the water on surface of your board, especially in charging port and do not charge your board until it gets dry. Then, idle motors of your board for 10 minutes in order to dry the inside of motors for avoiding rusts.
FYI, warranty doesn't include water.