They both do the same thing, but as far as I know, the gravity fed ones give more precision as they can use lower pressure and therefore do finer detail.
I've only used gravity fed rather than suction fed for doing body shells.
I have a big and dirty suction brush for doing my garden fence 😀
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I've got Araldite and a Swiss Army Knife - what more do I need?
Yokomo YZ-2
No 4WD because nothing lives up to my original Optima. Until now maybe?...
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