I've recently started repairing SMD electronics and my soldering skills have been lacking. After trying a cheap flux pen that seemed to be made mostly of alcohol, I saw a guy using this paste and decided to give it a try. It made a difference day and night. The paste is opaque when applied and stays exactly where you put it. When heat is applied it instantly becomes transparent and melts to flow exactly where you need it. It doesn't appear to be as smoky as the flux in most solders, but the smoke is still there and vacuuming the smoke is very useful. When soldering, the solder spreads much better and the connections shine with excellent connections. The only thing I don't like about it is that the syringe takes quite a bit of force to push the paste out and then has to pull back a little to stop too much. It's also worth noting that "impure" flux means that the flux left on the board after soldering will not harm the circuitry. Leaving it like this does not mean that it will evaporate without leaving a trace. A good scrub with 99% alcohol and an acid brush, then wiping the plate dry with a lint-free cloth will do the trick.
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