This little piece of plastic converts the trigger of a spray paint can from using one finger to using four. Such a simple solution, but a lot of people I talk to don't know about it.
If you haven't seen this handy tool hanging on the spray paint aisle at Home Depot and Lowes, it's there, and it's a must own for any home improvement tool box.
Here's a link to one at Amazon...just read the reviews. The best part is that it is very inexpensive and will last you forever (I think I've had mine over 10 years).
So before you spray paint ever again, go get one! Your pointer finger will thank me for it :)