piston valve sealing?

[haulinick]

i just made my first piston valve cannon. i am having a bit of trouble finding somthing that i can put on the piston that will seal up against the barrel. Any idea of somthing i can use or where to find it? i hav gotten shots of using just regular rubber from a bike tube but after a few shots it just goes to shit.

[SpudStuff]

are there OSH stores by your house?
if so fo to the place where you get hose and rope cut ast the person for rubber sheet or look around the base of the cutting table
also go to the grocery store and find a rubbery tuperware lid

[carlbelcher]

I would just go to your local hardware/ranch supply store (Home Depot or Lowe's) and look around of some rubber sheet. Most hardware stores have some rubber sheet for making gaskets it seems to work pretty well.

[SpudStuff]

i haven't found it at home depot.
the local specialty store has rubber to 3/4 inch thick and cuts the gaskets for you. i can also get the center circle scrap from the press for free

[MilkmanDanJr]

I bought something called a Quick Cap (or something like that) at Home Depot. It's just a rubber cap with a hose clamp around it that fits over the end of a piece of pipe. They come in various sizes and cost around 3 or 4 dollars. I cut one down into a rubber disc that fits the front my piston.

[SpudStuff]

oh yah ive see thoes but never bought goof find