I have this RTA...had it for about a month now...I get a little leak around the AFC. but never does it come pouring out or anything. I think it's more condensation than anything. I usually cut pretty beefy wicks for this RTA. Not length wise but width. You want a thick wick for it. A lot of cotton. I mean the wick has to almost not fit in the coil. You see some people wick really loose, this will not work for the Cleito. Also, in the juice holes you want it flush with the outside. If there is an indention at all it will leak. Completely fill the wicking channels. Also of course the viscosity of your juice will make a difference. If you are using a thin juice you will want to make them even thicker...These are made for at least 75/25 or somewhere in that ballpark. The thinner the juice the denser the wick has to be. Another tip, when wicking make sure the wicks are not touching the ir flow holes at all...push them away from it on the inside. watch this one, and see how "full" the juice channels are...