I have found that even when you are no longer getting vapor from your cartomizer, it is still actually damp, it just does not have enough liquid
to create the vapor, but it's still damp.
Never let it dry out completely or it's toast for sure!
A cartomizer will actually hold alot of liquid.
Just drip it around the sides to avoid that tube in the middle.
They will hold almost 2ml of juice.
Just add a few drops at a time. When that soaks in, add a few more drops.
When it's saturated, it will not soak in and will pool on top.
Just pour it out and put the little plastic piece back on and you are ready to vape.
If you still taste the burnt taste, check the wicking material inside your carto. If it's dark color, replace with a new one.
Once that wick material gets toasted, there is nothing you can do to fix it. You need a new one.