Mine will leak pretty bad if I fill and immediately let it sit without vaping it/priming it/building up vacuum. This is the only scenario which has caused leaking in my Lemos. Whenever I fill, I vape it strong for about 8-10 pulls at a minimum of 18 watts to build up a good vacuum and make sure everything is sealed properly. I suppose I could build up the vacuum without firing it too just by pulling on it w/out firing, but what's the fun in that?
Wicking is definitely key too. I've re-wicked these things so many times that I can pretty much eye-ball where to cut after pulling the wick through. I use Japanese cotton pads (Ko-Gen-Doh) - I cut a rather large piece (probably about 1/2" for a 1/8"/3.175mm inner diameter coil) and pull a "layer" off each side to expose only the fluffy innards of the cotton pad. I then twist one end in to a point and feed it through the coil (I will completely cut this twist off, don't want any twisted cotton in the coil) - there should be resistance but not too much. I trim both sides (looks like a bowtie when done), juice the wick, and then use a micro-flathead to "stick" the cotton down to the side of the deck... the ends are just slightly brushing up against the channels, but definitely not in them. I then put the lower chimney portion on and check the wick again to make sure the channels are clear. Drip more juice on the sides of the coil where the cotton is now resting until I start to see a little starting to come out on the outside of the lower chimney. Test fire.
Then I begin full assembly... I make sure the silicon washers for the glass are clean and dry. Set the silicon gaskets in their designated channels, making sure they're seated properly using my micro flathead. Juice the edge of the glass a little bit and then set it on the silicon and twist the glass until it slides nicely on top of the silicon. I then do the same to the top glass and silicon. Also put a small amount of liquid on the black upper chimney gasket as well, and then tighten everything up. I am a firm believer in lubricating gaskets; creates a great seal and also prevents them from getting bunched up/deformed when tightening things down.
Close everything before filling, cover all air holes and take a pull - nothing should happen/it should be completely closed down. If you get any airflow through it, break it down and try again.
Fill 'er up, seat the silicon "plug", twist on the base nice and tight and vape away. This is my method and I'm stickin' to it!
