They spark is fine.. I tried it early today and it shot. But sometimes the aquanet won't work so I blow it out use Axe and THUMP it shoots. And no I'm not using a chamber fan I have old computer fans I could use but I haven't intalled them and I'm just spraying it in

Hello I just made my first potato cannon out of PVC.. Anyway it shot the first couple times fine I use a grill ignitor and aquanet hairspray. Just last night it shot around 4 potato's and stopped fireing.??? I blow the chamber out when I'm done but it just wouldn't work. I let it sit for 3 hours... ...