Hvlp Gravity Gun

You can tip them back quite a bit but if you go too far you can get dripping from the cup or lose paint supply to the tip...both have happened to me and I hate it when that happens :o). As CNKS says, you can angle the gun to get at the undersides, however it is always best to have the pattern as near to 90 degrees to the surface as possible (in both directions). I also have not tried the baggie arrangement as my only gravity gun is a touch-up gun with a small cup...no commercial baggies available and I have not been successful in trying to adapt something.

The best way to get true all-position spraying, IMO, is to use a pressure fed arrangement with remote cup. It is a real pleasure to use. No weight of paint in the gun hand, usually up to 2 qts sprayable without refill and easy to get at the underside of things while keeping the pattern 90 degrees to the surface. And no worries about dripping out of the cup onto your fresh paint while you paint rims. If you've never tried it, you don't know what you're missing.

Rod