refurbishing a cannon with the kids

It shouldn't look like anything to you, just a jumble of construction materials and bike parts. The thing about this mess is that it can send a ski pole through a car door if I pump it up to 150PSI.I use it for 40ft fire balls, shooting confetti (big NONO at Dante's)and firing frozen hot dogs at people.
In this application I need it to shoot popcorn so I took it apart to clean out all the gunk.


The boy's art...it's call "Crime scene in egg carton"you can buy it for $40,000 or a ride on your bike.

See the insides were so full of now toxic gunk.