He repurposed the spray nozzle from a commercial spray paint can. By first releasing all of the pressure from the empty paint he could then use a hack saw to remove the top disk. He used Sugru to ...
go online and search for "custom spray paint." You'll find many companies (myperfectcolor.com is one) that can custom-mix just about any color you want, provided you know the paint manufacturer ...
Half-used cans of spray paint are a common product to have on hand. Maybe it was for touch-ups or a craft project but either way, it's too much left to let go of. But when you're not using it ...