Mr. Morton
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Many times it is dirty compressed air. I recommend the three stage SATA filter and a fresh air approved spray hose. You should change your hose every three months including the coupler and keep the spray end of your hose off the dirty floor.
Keep your booth balanced properly (slightly positive), and change the filters regularly.
If you are using a solvent borne basecoat, use a slower reducer so there is less dry overspray and tack between coats. For water borne base, use more water for the same reason.