Getting the pressure isnt the problem. Im mostly wondering what the best containers would be for it.

Thanks for this tip. Ill tty to see if I can find anything like that, though ive found finding proper pvc pipes is bothersomely difficult. If i can find any ill go for it, but if not ill still keep the water tip. And yeah ill avoid glass, much appreciated

Not american, we dont have that store. As for cheap even the cheap ones around whwre i live seem to be around 35-40 euro. Beside that do they work for casting epoxy? I couldnt find a clear answer

It doesnt have to be glass. Tin can is difficult to seal however and pop can's dont have a wide enough opening.

Its why i was also asking about plastic containers and if those could hold

Thing is i cant fit my mold through a bottle opening, and for mason jar im a little worried about if it does go wrong the glass would explode out. Would something like covering the sides with a blanket help with that?

I was intending to use a valve and pump from a bike wheel. Thats what they did in the tutorial and it seems like it should work fine since the pressure shouls be fairly low.

And also as that should hopefully clear up im not trying to make a vaccuum, im trying to add pressure.