You are not using cord designed to be candle wick.  Wicking has the proper
absorbing capability to allow the liquid wax to move up the wick.
 
 
In message Discussion of Bee Biology writes:
>  I have been doing some experiments with pure beeswax cylinders
>
>  The cylinders are approximately 2" in diameter and 2" inches high.
>
>  I have a waxed cord going through the center.
>
>  When I lite the waxed cord, the cord burns down to the intersection
>
>  of wax and cord, puddles,  and then extinguishes.
>
>
>  Why does the flame go out?
>
>   Dave Verville