Robin, I wouldnt use a razor blade on anything you really want to keep the finish intact. Glass windshields, sure. Paint is a no-no. You wont have to if you heat it up properly. Usually you can work a corner up with a fingernail and the sticker will peel right off as you heat it. If you have to scrape it, dont use a razor blade. Go with the credit card or something soft like a Popsicle stick or plastic scraper. Acetone will take the glue off too. I used it on my Merc with no ill effects.