QUOTE(Waliuuu @ Nov 5 2021, 04:19 PM)
May I know if you are using rubber or silicone wiper? I had original rubber wiper from factory before, didn't had any judder issue but the coating can't last long enough and wiper itself also didn't last.. Then I switched over to silicone wiper, the coating can last more than a year but wiper judders if the windscreen is not wet enough.. I'm guessing the material and the length matters? If too long the arm cannot provide enough force to press the wiper down, resulting in judder?
I had the same issue too, initially I thought my windscreen is not clean or the coating from previous owner is wearing out or the wiper blade is too long (too much surface area to cover). I tried polishing the windscreen clean but it doesn't help much. I'm using PIAA Si Tech wiper which works well when new but after a year it started to judder as well. One of the last resort I tried was graphite powder and surprisingly it fixed my problem.
See if you can find any graphite powder
I got mine from taobao, they're dirt cheap, maybe u can find them on shopee. Graphite powder is usually used for lubricating key locks
What I did was, pour some graphite powder onto tissue paper then wipe them on the wiper blades so the blades are coated with a layer of graphite. If u want even better lubrication, with the remnants of graphite on ur tissue paper, wipe your windscreen with it.
That's should eliminate all judders even when windscreen is dry