OR... Tip dry, when spraying continued fine lines you can get a build up on the need, I work without the air cap on ( fatal if you drop it ) and then just have a tissue soaked in thinner and wipe the tip of the needle very carefully every time I see it's building it. It's a problem that happens more with water based paints but any paint will do it if you're doing constant fine line work.
If you wipe the needle though be super careful as they easy to bend and then you won't get a fine line.
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