Your at that point in the painting where its time to shade, or add maybe a mist or clouds. Everyone has. I chose to do white mist under the mountains. The problem is, when i spray, i tend to leave a lot of after spray that makes its way into the top of the painting. This spray settles and somewhat dulls the colors and details of the painting. This occurs most prevalently with the white paint. So, my question is;

Are there any techniques and/or ideas to help prevent this spray from getting all over the painting?

Thanks

PuN

try angling the can so you are spraying downward instead of upward. also if you are adding clouds put the stencil on top to block any overspray. also holding the can closer the the painting will reduce overspray, but youll need to move the can faster as you spray so as not to add too much paint.

i was going to suggest the same - when i'm at that point i change my angle of spray so that the overspray goes toward the bottom of the painting that i havent gotten to yet.  And yeah like brandon said above, short quick bursts will also minimize the overspray.  good luck man!