Plexiglas scraper blades also lose their sharp edge. If you wax often, you will soon notice that your blade no longer scrapes cleanly and there is more smearing than shavings falling. You can sharpen your Plexi file again with the Scraper Sharpener. It is suitable for scraper blades from 3 to 6 mm. A radial file is included. It is best to screw the scraper sharpener onto a table so that you can sharpen properly.