Reply by Rich

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Posted on Fuji Semi Pro 2 M Gun Question

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4813 posts in 1069 days

#1 posted 07-19-2018 01:59 PM

You’re exactly right that that style of feed pretty much eliminates any worry about which way to go, since you can get aftermarket kits for roughly $30 that can convert from gravity to siphon, and vice versa. Don’t worry about the U-shaped tube making it hard to clean. In everyday cleaning, it’ll just flush out. Unless you neglect cleaning you won’t need to brush it or anything.

My original Fuji gun that came with my turbine (20 yr old Q4) is a siphon. I bought an aftermarket kit that converts it into the same gravity feed profile as the one you’re looking at with the U-shaped tube. I also have an aftermarket gun (see my review) that is gravity feed and feeds at the top of the gun body. Functionally, there’s really no difference. They all do a great job.

Where I do pick a specific one is when I’m spraying lower-sheen lacquers. I leave the lacquer in the gun while I’m doing the job, and sometimes that’s several days. The flattener settles out of the lacquer, and it’s much easier to get it back into suspension with a siphon setup. I can just take the cup and swirl it until it’s mixed. With a gravity feed, it settles down and there’s really no option other than to dump the lacquer, flush it with solvent and refill. Given that some lacquers settle too much to spray in less than an hour, that’s a pain in the butt, so I go siphon for that.

You’re right that the gravity gun is a little easier to clean since you just empty it and flush it a couple of times with the appropriate solvent and you’re done. The siphon gun requires more rinsing and also requires more solvent to make sure you’re reaching the feed tube. Not that big of a deal overall.

The bottom line is, pick one based on what you feel you need right now, and then for a few bucks you can convert it back and forth anytime you need.

-- There's no such thing as a careless electrician

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