well, anything Traxxas (electronics wise) is waterproof. the reason he said that on the E-Revo is because it (or at least the BL version) uses a Castle Creations ESC that is NOT waterproof and actually very water sensitive I've heard. so anything but the E-Maxx Brushless Edition and E-Revo Brushless Edition are waterproof. just keep in mind that this means the electronics are waterproof, not the chassis (bearings, etc.).