Originally Posted by
sherwood
it screws up the surface tension required to get a clean wipe with a blade. it should only be used on glass surfaces that don't have wipers (side windows, back window, mirrors)
ya he's correct. using something like rain-x or any type of paint sealant on the windshield will cause your wiper blades to chatter and skip under use.
rain-x works fine if you don't plan on using your wipers or don't have any at all