[Zeke]

I'm thinking of storing my rattle cans upside down as long as they have a cap. When paint pigments settle they settle all over the bottom and the ball can't get into the crease. If some of that sludge gets free and gets to the straw, you're done with that can.

Realistically, the sludge can get into places while the can is inverted as well. Best to agitate the cans periodically like turning bottles on champagne. Just one more thing to have to do. When they were 3 bucks ea who cared?