Quick answer: For spray painting, the spray gun’s air demand sets the compressor size. Match delivered CFM at the gun’s required PSI, then consider duty cycle, tank recovery, filtration, and moisture control. A large tank with a weak pump is not enough.
Start with the spray gun
Read the gun’s specified CFM and pressure at the inlet. HVLP and conventional guns differ widely, so do not buy from a generic tank-size chart. If the compressor cannot maintain the required flow, atomization and finish quality can change as pressure falls.
Plan for sustained spraying
Estimate how long the trigger will be held during a panel or project. A tank buffers short bursts, but the pump must replenish air across the session. Compare delivered CFM at the working pressure and the compressor’s duty rating. Check the circuit and startup current at your site.
Protect the finish and operator
Water or oil in the air line can spoil coatings. Use the filtration, water separation, and hose arrangement recommended for the coating and gun. Follow product ventilation and respiratory-protection instructions; many coatings create hazardous vapors. Never spray in an unsuitable enclosed space.
Need help matching these checks to a specific model? Ask the KayrosTool team with the product name and your intended use.