What is Thinner?

Paint thinner is a solvent used to reduce the viscosity of oil-based paints, stains, and varnishes to achieve the correct consistency for brushing, rolling, or spraying. Common thinners include mineral spirits, naphtha, and turpentine. Thinning paint too much reduces coverage and film build, while too little thinner can cause brush drag and poor leveling. Water is used to thin latex and acrylic paints. Always follow the manufacturer's thinning recommendations for best results.