The fill-rest-check routine covers most leaks, but not all. Here's when it won't save you.

Cracked pod or tank. If you see a visible crack, no routine will help. Replace the pod—don't try to patch it. Glue and tape break down in e-liquid and you'll end up vaping something you shouldn't.

Leaking from the bottom, not the airflow. That points to a worn base seal or a damaged coil. Try a fresh coil first; if it still leaks, the pod is done.

Leaks that happen even when you never overfill and always rest. Some devices just have a bad batch of pods. If you've gone through two pods with the same leak pattern, consider a different pod brand or a different device altogether. Not every kit is built the same.

And if you're using a WINDBAR device like the VERTEX-VISTA or LINQ-SLIM, the same logic applies—check the pod, not the battery.