I have seen videos on refilling soft top cartomizers on `utube` where the white cap is left on while filling. When a small drop of juice is seen at the cap opening, they say it is full and you can vape immediately. My question is, isn't this overfilling and won't it flood the carto and make a mess? Or am I suppose to blow it out after filling. Seems they don't ever show any flooding problems. Have not tried it to find out. Maybe I am not getting it right.