how far back does the gun need to be so the air pressure dosent blow the drops everywhere.

shouldn't be ANY drops coming from the gun, at all

:agree: If there's ANY water you need to get a good filter. I use a canister filter at the wall and a small plastic disposable filter at the gun and it works fine.

I think he may be talking about the custom paint that you use water drops then spray over them like >X< did
http://67-72chevytrucks.com/vboard/attachment.php?attachmentid=295903&stc=1&d=1188786790

oh ... ok ... in that case, you shouldn't be using a "gun" ... you should be using an airbrush ...

I'm gonna have to bow out on that one. I've never don it before.

Dubies got you lined out.
ALWAYS test the gun psi and distance BEFORE you add paint.
Do a "dry" run with just air first to make SURE you got it figured out.
Nothing worse than spraying paint and water scrambling all over the place.
One member uses a pump up sprayer instead of a squirt bottle and it does do a better job IMO. Kinda like an actual rain.
Fraser adds a little Glycerin to the water which supposedly helps it adhere better.