Quote Originally Posted by m_c View Post
If you're soldering new components, the flux in common solder should be more than enough to ensure a good solder joint. Any common solder you buy for electronics should be flux cored.

It must be over 10 years since I last used separate flux, and that was dealing with vehicle earth points that had been exposed to a couple British winters. I've certainly never used it on any PCB I've soldered.
I have been working with electronics since the mid 70's and as long as I remember, there have ALWAYS been flux in the solder wires I used. I never bought any separate flux ever in my life. As far as I know, flux in liquid or hard form is only used for soldering pipes and other very large surfaces, not PCB.