Each application is a little different, as are people's tastes. I have this rayon, Japanese organic cotton pads (Labo), organic cotton balls from Walgreens, SS mesh for my gennies, and 2mm silica for my NR-R-NR builds.So you can use rayon to vape? I've always stuck with 100% cotton and had great results. It's great that we have this community to learn new things.
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The thing about the rayon is its lifespan - I've run more then 100 ml through a coil, and the wicks are good - and the cost - $15 for 500' (about 2 wicks to the inch, so 12,000 wicks...) vs. $10 for 200 pieces cotton or $4 for 80 cotton balls.
I think really, at $15, $10 (I actually caught a sale and paid $5), and $4, buy all of 'em... less than $30, and you'll never need wick again!