You've been told that 9H hardness means your car's paint is protected like a fortress. That claim sells thousands of ceramic coatings each year. But it’s also one of the most misunderstood messages in auto detailing. 9H hardness isn’t based on the Mohs hardness scale you learned in school. Instead, it comes from a pencil test meant for measuring industrial coatings on metal, not for car paint. And it definitely doesn't mean your car is now scratch-proof. You're not alone if y