Boom! The classic potato gun harnesses the combustion of flammable vapor. Show us your combustion spud gun and discuss fuels, ratios, safety, ignition systems, tools, and more.
That is an ABS cannon is it not?, and if it is the cannon will tear unlike PVC which would shatter, but you are right whether it tears or shrapnels a duct tape covering would come apart
Not to say your cannon would be exploding anytime soon