I installed it professionally. Both front and rear (I used 4pcs, two sets and 10 leds). My friend professionally assembled them and then we played with the order to make the patterns look cute. Check out the videos I have. One is in front of the car, the other behind. He placed something on the back of the fittings to seal them and prevent water from entering. I've been to several car washes and no problems. So do it right and you should be good.
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