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I had one that I wrapped in gaffa tape to increase the strength a bit and it easily held 150psi. Two old valves stuck through the lid with a bit of epoxy and a 5mm i.d. hose of your choice, zip-tied on to one of the valves (with valve core removed). It helps to have a third had to kink the exit hose until you want to release the blast. That way it's someone else's head next to the tire too. ;)
Coolest bit of DIY I've seen in a while! What pressure will it hold? What pressure fittings did you use?