Anna, while I've never done so, will have to give rayon a try, based on your opinion.
Not a lot to lose & maybe a lot to gain. While I have no trouble with building coils, using various screwdrivers the same sizes as on the coil jig (feels more comfortable), wicking can be a pain on some tanks. While I rarely have leaks, sometimes dry hits are an issue. I'll fluff, comb & whatever & still get dry hits.
Yet upon removal, the wick won't be burned, often comes out the color of the e-juice, must be still packing a bit too much in there,
or using the wrong type of cotton. Most says Japanese organic is the best & when it works is great. Yet on middle sized & large tanks (especially the SMOK TFV12 Cloud Beast RBA edition), nothing has gone right since the original 5 wrap flat spaced coils were changed.
Unfortunately, I didn't save these, allowed a friend to build a 'better' coil at a party, so don't have what was there to compare with. That was when things went downhill with that tank. Am on the verge of unloading to the first friend who wants it for $20, to include the separately purchased RBA with the single coil adapter.
Anyway, thanks for the rayon idea.
Cat