Plastic razor blades scrape grime, glue and other shop scum without collateral damage to your tools and projects. They make excellent small putty knives and epoxy squeegees. Although safer than steel razors, they’re sharp enough to remove dried paint from windowpanes and glue dribble from woodwork. (We recommend waiting until the glue is semi-hard to avoid additional squeeze-out.) The general-purpose blades flex somewhat to conform to curved surfaces like windshields and tool handles. They are ideal for use on softwoods like pine.