>but that flux helped created a sort of wicking action
>to get solder to flow properly.

I get taught that the flux is there to help the solder wet the two parts of 
the joint. In the case of solder wick it helps the solder wet the copper in 
the wick, which makes the solder flow, and then the wicking action happens 
because the solder can now stick to the copper in the wick. 

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