So other great ways to Weather stuff..
1) Airbrush.... great for doing over sprays.. and misting... with a even coat of paint... *I use this on my Fett prop*
2) Dry Brushing.... Dip a brush into some paint that you want to use to weather.. dab it onto a cloth.. or palette.. till there is little paint on the brush.. brush onto piece.. test first to make sure its the colour and a proper amount of paint is on the brush *Not to much* and brush till the paint is almost transparent.. This to me is a quick and majorly nice looking weathering process if done right.
3) Scrapping and scratching and highlights. I find after I have done either of the top two steps... and good scratching the item with a needle to score it up a bit.. and adding highlights.. and wear marks to the edges of a item.. make the age of the weathering come right out... even if a scratch has gone to far down in the paint.. and the actual original item colour is showing a bit.. this just ads to it.. I feel.
Also putting some little details into the item sure does help. I to sometimes get lazy and say its good enough.. but then I add say to a metal colour, a little mark or smudge of orange.. or red to it.. gives it a bit of rust look.. Plus little details like that.. sure do make the item even more attractive.. and realistic...
Hope that helps a bit...