Tks for the inputs! Question: for cartos, how does one know when to replace it? And for tanks... wats out there that has no leakage issues?
You will notice the pull or draw will become increasingly stiffer and there will be a flavor drop off. This will happen sooner if you are using darker colored juices or of a heavier vg ratio. What eventually happens is the polyfill becomes clogged with the unvapable particles that is in e-juice.
There's nothing finer than the first several draws off of a fresh carto in a tank bathed in your favorite juice.
The only tank that I ever had that leaked was my very first Smoktech DCT tank that had a polycarbonate tube. The tube somehow warped out of shape and leaked juice because of poor contact between the tube and endcap. I suspect most leaking tank issues originate from the cartomizer and poor user technique.
It can be easy to flood a carto if you don't adjust your vaping technique. Slow long gentle draws are best. Hard and short draws can pull too much juice into the carto and flood it.
Some carto brands are notorious to flood easily. Too many or too large of punched holes in the carto can cause flooding. Allowing juice to get into the air hole while filling a carto from the top can cause flooding (put a wooden tooth pic in the air hole to block juice).
Inserting a prepped carto all the way into the tank, and then putting the top cap on a full tank of juice can cause flooding. Always fill the tank with both endcaps on and the carto only partially inserted.
All of the above are all poor technique, user-error related issues.
Worn out or torn o-rings can cause a tank to leak. The top edge of the cartomizer can cause damage to the silicone rings as it passes through the end caps. A tool like the Slap-Yo-Moma tank accessory tool from Big Daddy Vapor can prevent this from happening.