Flame spraying is a thermal spray coating process that uses a flame to melt and propel materials onto a surface. This technique typically involves a fuel gas, such as acetylene, and oxygen to create a high-temperature flame. The molten particles are then sprayed onto the substrate, forming a protective or decorative coating. The process is widely used in various industries, including aerospace, automotive, and manufacturing, to enhance surface properties like wear resistance, corrosion resistance, and thermal insulation. Flame spraying can apply a range of materials, including metals, ceramics, and polymers, making it a versatile option for surface treatment.