The E36 fog lights are notorious for cracking from being pelted by rocks during freeway driving. After going through two sets in just two years, I decided to coat the third set with 3M Paint Defender in hopes they would save me from the aggravation of needing to replace the lights so often. Boom! They have held up perfectly for over a year now. Not even a scratch and I anticipate them to continue to hold up for the foreseeable future. Highly recommended!