Too late, ordered some rayon from Amazon for 6.00 plus free shipping... not out too much if i don't like it..
I haven't tried rayon, so I can't say good or bad about it. Some people swear by it. I've used Silica in the past, and can taste it, and have tried other wicking methods, but I always go back to Japanese cotton. When I saw the rayon, I thought it was just another fad wicking method. There was a time when a new wicking materials came out almost daily. I have my own opinions about them, and I tried a few. Still went back to organic Japanese cotton. Other wicking materials I've seen...
Silica
SS wire (for Genesis(bottom feeding, where a tank wicks up to the coil above) style tanks).
Hemp
Ready-X (I think this is simply another silica wick)
Rayon
Ceramic (you could make one from an aquatic bubblestone)
cotton yarn (It still tastes bad)
boiled organic cotton (too much work)
Cotton Bacon (I think this will probably be fine, just someone else boiling it and preparing it for ya)
Japanese cotton (ko-gen-do and Muji) (my favorite)
Ekowool (just a hollow silica wick)
CelluCotton (could be good)
SS mesh.
(varius) type cotton... several brands, I'll lump them all together in one type... many claim to burn less than japanese cotton. Texas Tuff, Pima, etc....
Just a few choices. out there.