The electric wiper is of marine nature, 2 biggest issues I'm aware of are the small blade and the wiper arm pinches the round shaft of the wiper motor so sometimes they are not holding well and walking on the shaft or the wiper arm breaks from over tension of the bolt. A new wiper arm may cure the walking, though I've considered drilling the arm and threading it for a set screw to use as a jam screw like used in the drive sprockets.