UPDATE!!!!....after I put something under the topfill gasket to raise it a bit I have no flooding problem and also I can vape it with tighter bottom airflow now it's much different I waited enough to make sure I I don't know if the top should be air sealed 100% but took it apart and test it with mouth and it was leaking air and after the "fix" it was almost totally sealed Soo it works and it's fine now....sooooooo from what other hellvape users say and the problems they have I am sure now it's just a problem with some of those tanks topfill gaskets....the slide topfill was tight before but the thing is that there is a small gap in all hellvape MDS and it's easily visible through video rewiews on youtube also but mine and I guess also many others have bigger gap...at least after 14days I can rest now and vape like a boss *thuglife hahahah that topfill slide mechanism seemed bad idea to me in my zlide tank also but it's convenient and people like that innokin did the gasket better but the slide became lose in first week in mine and it's wierd but ok with that atomizer i don't get flooding problems like with the md....other than that I like my hellvape md YAAAAAAAAAAY THANKS TO EVERYBODY THAT TOOK TIME TO HELP OR EVEN COMMENT <3