Maybe I used the wrong term (Im still a newbie ).. I meant getting the wicking wet.. aka priming it for first use ?
I'm thinking the air channels in the "U" might make priming the coil more difficult.. ?
I have 2 of these tanks, and I absolutely love everything about my experience with them. The U coil is a dvc/bvc hybridish thing (in my own words) with the bottom airway closed off. The air comes in from the top, is pulled to the bottom passed one coil and rerouted back upwards past the second coil back out the top to the drip tip. I prime mine two different ways depending on what juice I'm filling the tank with.
Thicker, or sweeter, stickier or high vg juice: fill the tank, assemble, close the air flow, take a few hard drags and let sit a minute before starting mod. thinner, or high pg, or alcohol containing etc juice: fill the tank, put 2 drops into the air inlet (this is the bottom hole on the coil just below the outlet you can see from the drip tip when assembled), assemble, let soak a couple of minutes before starting mod.
This is my own experience or opinion. I'm not an expert by far. I've been ghosting the forum awhile, never feeling knowledgeable enough to pitch in. Forgive me, don't go too hard on me...