Q: We’re preparing to purchase new spray guns to replace our current HVLP guns. We’ve seen some guns advertised as HVLP “Compliant”. What does this mean? Can we use them if HVLP guns are allowed in our area?
A: Regulatory agencies consider a spray gun to be an “HVLP” gun if the air cap pressure is at or below 10psi. Unfortunately, with some guns, 10psi is not adequate to properly atomize heavier materials. As a result, finish quality can suffer.
Some spray gun companies have introduced guns that can operate above the 10psi limit, and they have dubbed them “HVLP Compliant” guns. It is very important to understand when you can and cannot legally use these products though. If you are in an area where the use of HVLP guns is required, you must check with your local Air Quality Agency to see if any “HVLP Compliant” guns have been specifically approved. Because this involves an in-depth testing process, many spray gun manufacturers have not taken the time to have their spray guns approved for use in all markets. Even in the larger markets (like Southern California) the “Compliant” guns may only be approved for use in one industry – typically automobile refinishing. Therefore, if you’re using a “Compliant” gun for aerospace coatings or general metal finishing, you may actually be violating your permit!
Again, check with your local permitting authority to be sure. Or, consider purchasing guns with new technology that allow you to properly atomization your coating while operating below the 10psi HVLP limit.
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