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Hi Charles, What the problem is, compressed air is a refrigerant and your 50ft air hose has moisture in it so when the compressed air rushes over the inside airline, the moisture condenses and comes out the gun. This providing that your moisture removal system is adaquote at the compressor discharge. If your compressor is not portable, you can use a old refrigerator freezer as a air/water condensor/dryer. Keep the freezer at 32F What you might try is using a shorter airline and installing ball valves on both ends of the 50ft airline, put a vacuum pump on the airline and pump at 29.925hg for one hour, this will boil the water out at 70F, or buy new airline, then purge the airline with dry nitrogen turning off both ball valves traping the nitrogen charge so the airline wouldn't gather moisture when not in use. As long as the airline was kept pressured with nitrogen then it would not have to be revacuumed nor gather moisture. As you can tell I'm not a painter but am a refrigeration engineer, and I have solved a few moisture rated problems for a few painters. T_Bone
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