More control over where the solder will travel – Wherever you apply the flux, the solder will flow to.
Expedites the soldering process – It takes less heat and time to get the solder to flow where you need it.
Results in a stronger connection – The flux allows the solder to bond properly throughout the target area.
Protects the solder joint – This paste not have to be cleaned off after soldering and the residue actually provides a protective coating from corrosion.