This will depend on the product you choose - most come with an adhesive designed especially for automotive use, so it’s unlikely that the bar itself will come unstuck. As for the LED lights, durability will vary. A good quality set will last for anywhere from 30,000 to 100,000 hours of use. In real-life terms, this means you’ll be able to cover well over 100,000 miles before you need to worry about replacing the lights! This incredible durability stems from the low energy usage of LEDs.