Just finished doing a very similar stripe to yours. Check out the thread here: http://www.garagejournal.com/forum/showthread.php?t=20421
I did have to go back and edge all the lines with white paint again after using painter's tape. My wall was just too rough to get a good clean line even after...
After reading the site for a while and not posting much of anything, I thought it was time to make a post with my progress to date.
Started with a normal 2 car garage:
First step was to paint the ceiling:
Then put two coats on the walls and started adding some lights:
Added a...