Great minds think alikeI know you spent much time in the Rayon Pt1 and Pt2 threads and then much more time trying to get your rayon wicking down.
When I pull a rayon wick through a coil it's firm. And I do mean FIRM, but not overly firm.
As you read in those threads, firm = hearing a "squeaking" sound OR feeling that as a "vibration" on your fingers. Rayon requires 30% more versus cotton. [contraction vs. expansion]
I don't use 28g wire anymore, it's too flimsy (for me). With 28g wire you need to hold the coil in-place with a fingernail when pulling rayon through or it can (will) move the coil. I do use 27g SS316L in some builds.
Just curious, have you tried running flavorless in one of your rta's with a rayon wick?
If so, did you get the same black rayon?
Here is a photo of my Creek rda with a Tidi rayon wick. I run it on a squonker with flavorless. The wick has been used for just over a month. Daily use.
View attachment 995055
I pulled the wick through the coil so you can see the part of the wick that was in the coil. No part of the wick shows any burning. And there is no crud on the coil (as expected w/flavorless).
FWIW, I run that setup between 24w - 32w. The coil is a SS316L 26/36 Clapton with a 3.5ID.
I will shoot some step-by-step photos next time I rewick my KFL19 and send those off to you.
Probably be in the next 1-2 days.
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I forgot to add before: I've easily gone through well over 1L of unflavored off a single rayon wick in the Kayfun Prime. I don't bother to measure because the wicks last so darn long. I've had a single coil last over 2 years.