An HVOF gun, short for High-Velocity Oxy-Fuel gun, is a specialized thermal spray device used to apply high-density, extremely wear-resistant coatings on metal surfaces. The HVOF process has become one of the most trusted surface engineering technologies in industries that demand maximum durability, including aerospace, oil and gas, power generation, automotive, printing, and heavy manufacturing. What sets an HVOF gun apart from other thermal spray gun systems is its ability to propel molten or semi-molten coating powder particles at supersonic velocities, often exceeding 700–1200 m/s, resulting in exceptionally strong and tightly bonded coatings.