Oxidation.

This Strip Paint & Rust Stripper Grinder is the perfect tool to remove paint, oxidation, and other coatings from surfaces. It easily grinds away layers of paint and rust with its powerful motor, making it simple to restore metal, wood, concrete, masonry, and more to their original condition. The grinder has a comfortable handle and easy-to-use controls that make it easy to adjust the speed and pressure for different projects. With its adjustable guard and built-in dust collection port, this stripper grinder is an excellent choice for any DIY or professional project. Read on to find out why this product is so great!