I use both carto and clearo tanks and the only one I haven't had leak on me is my Uni-Tank and I think that is just because it's so new it hasn't had the chance to.

Even my cheapo 5 dollar Boge F-17 plastic carto tanks don't leak anymore now that I've got the hang of them. But I had a few messy flood incidents in the beginning that I wasn't exactly going to broadcast on here...It's amazing how embarrassed you can be when no one is watching.
Any tank can leak if you draw the lucky one from the batch....I didn't read every post on here but I am willing to bet that 90 plus percent of the tanks discussed threw this thread a China made in droves upwards of the thousands on factory assembly lines and just like any other mass produced piece there's going to be a couple bad apples. I use a lot of Kanger Tanks. Let's use the Pro Tank for an example...
I have only one Pro Tank version one because when I started vaping I didn't need a glass tank and then I started mixing my own juice and figured out my favorite home mix has citric acid in it...after being lucky and not destroying a T2 I bought a protank around the time the protank two was coming out so since I could no longer get a Protank One in the color I wanted I bought the second version to see if it really was that much better...and I liked it. I don't think it solved all the problems of a protank but it was solid enough that I ordered a second one so I'd have a spair just in case something happened to my first one since I am kinda clumbsy these days. My second one came in the mail, I was so excited as I cleaned it up ad rinsed it off and loaded a 1.8 ohm coil into it and screwed on an e-Go battery to see how these things tasted worked with a low resistance coil on it....and I got the worst dry hit I have ever gotten. So I decided to wait awhile, a few dry hits and bubbles, and I tried again...and still that taste...No problem, it has to just be a bad coil, I'll try another one....And the same thing...oh and somehow I flooded it and made it leak a few times too onto my battery connection
So I after I tried a few different coils and a lot of waisted time I put a different base on it thinking there must be a machining error on it and it's not flowing correctly...and I'd still get that burned taste no matter how many dry hits or time went by or what juice I switched to...meanwhile I've got 4 Protank 2 Mini's and my other PT2 that fires just fine. So I'd try the same coil in a different one and it would work....or I'd get that bad tank to fire and I'd manage to flood it and be ...... as I cleaned it up. I even put it on my Evic because it has the ability to ajust Watts in .1 increments and not just volts with a 2.5 Ohm coil and still got a burned taste and got that coil to work fine in another tank. I switched the bottom part that connects to the base and it works now, I can't explain it...there's some minor defect in it that doesn't make it flow right....
Anyways my point is this. Even the more expensive tanks can leak. You can do everything right and have a bad apple once in awhile. Even when you have a tank there is nothing wrong with it can flood or leak over time if you don't keep up on it.
I used to think my T3s's leaked till I started blocking the air tube with a precision tip Q-tip or using a needle tiped bottle to fill them. And if you don't use them everyday while there is liquid in them they will slowly build up liquid on the coil and flood. All my Kanger tanks do this I've noticed. Bad tanks happen but there is also a little bit of upkeep too with vaping tanks. This is my two cents for what it is worth.
I hope my experience is of some small help and best of luck to you. and always...Happy Vaping!
