Sounds like the clear on those BMWs is a *LOT* thicker than the stuff on any of my interior pieces. I`d never even get *CLOSE* to using 4K on mine as I`d compromise it.

Marring on interior wood is one of those things where I`ve had to settle for knowing when to say when..it`s gonna happen with our vehicles, just the nature of how they`re used Sorta like a certain degree of marring on the paint, no matter how careful we are, Real Life just keeps happening.