Rebuilt Protanks leaking...

[spydre]

This is my final guess, since I can't see your rebuild) - you say you use cotton. I would bet your cotton wick does not have enough material. The juice is flowing too heavily to the coil and is not restricted enough. Remember, as the juice wicks and is constantly being fired by the coil, the wick contracts and gets gooey with deposits from sugars and whatnot in flavoring. This does two things, the wick loses its elasticity(stays compressed) and loses its ability to hold the juice. Once that happens the juice gets by the coil and into the airway and battery.

Try beefing up your wick (more cotton) and not necessarily more flavor wick.

(I don't believe in demons. )

Bebop, does that happen with silica wicks as well?

[Bebop]

silica wicks are already more dense and more uniform in size. They tend to expand when wet. But they are subject to the caramelization that takes place at the coil. Over time they become stiff and bond with the coil. They lose the ability to hold moisture, hence the gradual "dry" hit that comes about after a few tanks. Silica also doesn't burn. This had me fooled for a while because I always thought the "burning" taste in an old coil was the silica but it's not. The burning comes from the caramelization of the juice compounds and the gradual takeover of the coil by the caramelization. Dry burning of silica wicks gets rid of this caramelization for the most part but it's not 100%, so eventually the coil will not recover after a few dry burns. Eventually the silica does weaken and deteriorate from the heat. I can lengthen the life of a factory coil by cleaning and dry burning, maybe 2 or 3X but I think it is wise to just toss them or rebuild them after that because it probably isn't healthy to be inhaling "burnt" juice.

[spydre]

Hmmm, that's good to know about the burning taste in well used coil. Thanks!