a coin works and it won't damage anything unless you do it like a crackhead, the paint and metal is paper thin already this will be the least of your worries, the tiniest tap, bump, scuff is going to leave a mark on your vehicle, since 2015 the metal is noticeably thinner and the paint is softer. rub your fingers on it and it will leave a mark. you will most likely first notice it around the door handles and how bad it shows will depend on the paint color, darker colors will show it more than lighter colors