Is mild active rosin flux better for Pb free solder?

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I have Kester 186 and 2331 fluxes. I'm going to start using Pb free solders and was wondering which one of these I should use? 186 is a mildly active rosin flux and is the sort of thing I'm used to, but 2331 is this organic water soluable stuff. Not sure which to use.
 
I tried the pb free solder and absolutely hated it. I had trouble getting it to flow properly unless I used a 40+ watt iron. This was the whisker thin stuff, not thick solder at all. Your mileage may vary though since you are probably using a different flux that I did.

What I had (the flux that is) I picked up from Radio Shack a few years back, but soldering with and without it gave me the same results.

Let us know how your results turn out and what you did to achieve them. I sort of hate to waste a pound of solder ...lol.
 
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