Uh! Never bought from Fastech.
I use Cotton Bacon and recently I've been using Fiber Freaks precut wicks (cotton and cellulose) that work great for 2mm or 2.5 mm coils.
If you live in USA there are a lot of online stores that sell cotton and wire
I use 28 gauge Kanthal but if you prefer lower ohm builds you can use 26g or even 24g (have not tried it because I'm a tootle puffer)
I guess that you can also get a building kit in the States
I'm convinced that building is best. But don't throw away your premade coils RBAs, some times you will use them . I know I do with my Kabukis but most of the time I enjoy my kayuns
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