Paint stripper is a chemical product used to remove paint, varnish, or other finishes from surfaces. It works by breaking down the bonds between the paint and the material underneath, making it easier to scrape off. Paint strippers come in various forms, including liquids, gels, and pastes, and can be used on wood, metal, and masonry. There are two main types of paint strippers: solvent-based and caustic-based. Solvent-based strippers use organic solvents to dissolve paint, while caustic-based strippers contain alkaline substances that break down the paint's structure. Both types can be effective, but safety precautions are essential when using them.