Shading with spray paints

It depends a bit on the brand of spray can.  Most of them have nozzles that put out a pretty heavy spray, which tends to cover with a thick coat.  The new Tamiya cans, and several other brands of small hobby cans have finer nozzles, but not all.

Not possible at all. You'll have much better luck using pastels and oil paints to do ur weatherering if u don't have an airbrush.

Awesome thanks for the advice guys. Yeah I did a few practice runs on some old models and the final result kept ending in whatever I sprayed on last. While I'm thinking of it, do any of you guys know how to post images on here, I'd like to show my progress but I haven't been able to figure out how to post them.

AIRBORNE_TROOPER11B

1. Get/have a Photobucket (PB) account 
2. on the PB image select "direct" link
3. it should copy as you hover and click on that link
4. Back to FSM  use the "Use Rich Formatting" (lower left  next to "reply" button )option
5. in the window that opens look on the tool bar for the "picture" icon ,
6.  click that
7. paste your PB direct data link in the space provided, click "insert"
8. your picture will appear in  on your reply 

Do this for each picture you wish to enter

Also works for emoticons not found on the FSM tool bar