machine wax

[grizzlybearjr]

i found that it doesn't make a very sturdy piston but it is a affective ammo if you can find it a a affordable price

[Demon]

I am not sure it is a good idea because the wax will stick in the cannon, maybe lubrificate the round before shooting?

I prefer potato's

Makes your gun more "homemade"

And i am not surprised that it doesn't make a good piston

[grizzlybearjr]

i will shatter after a few uses will last a while shatters but will fail eventually.
i thought so to thats why i tried it but it was a failure

[Demon]

You l'be better with a pvc endcap piston, work very well.