Well, update time. I got the pliers, tightened it as much as possible, and it still leaks

Re-tried the water test, and im not even 100% sure where it's escaping from anymore really, cant pinpoint if its where i thought it was from, or if its possibly from the botton of the adaptor which is screwed onto the can.
I might just contact the seller and tell him it doesn't work and see what he says, although a replacement probably wouldnt make much difference if they're just poorly made. Typical of my luck really
Im itching to paint this tank, and i was really hoping to use the airbrush and get a nice smooth finish with the base coat, but looks like it's back to a brush now
