Andres4NY, (edited ) 
"Hm.. 1 quart should be enough to paint the bike box, I think."
[..days later..]
"Alright [#6yo], you go ahead and shake this [closed] can while I run in for 15 seconds to fill this container up with water."
(The paint that's visible in the can is all that remains after the rest was dumped on the ground)