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how that type of guns work is the cup gets pressurized . so they are knid of like a HVLP spray set up .
do they work ???? well i used one like that when i was a young man to clear my airbush work . and yes it did lay down the clear ok but just ok and never like glass . alot of that was the tip size that came in the gun i had . i still have it some were . it was some thing like a 1.6 or 1.7 when i realy needed a 1.3 or 1.4 tip for it . going to a smaller tip atomizes the top coats better with most paint systems .
they still make siphon feed guns that are HVLP . you don't need to have the cup on the top of the gun to have it a HVLP gun at all .
why gravity feed guns are so popular are because every drop of product you put into the gun will get used unlike they do with a siphon feed type gun . with a siphon gun you always get a little product left in the cup that can't get sucked out . also a siphon gun will spit as you get just that little product left in the cup . an other down side to siphon guns is that when your refinishing some like a roof you could hit the roof with the cup of the gun . there is also better balance with a gravity feed gun when the air line is cuppled (pluged into )to the gun .
because a HVLP gun will not work as it should with out getting all new hvlp air lines , cupplers , fittings , regulator and so on from the air tank to the gun . you can look for hvlp compliant guns they will work with out changing every thing over to hvlp .
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