I've used this stuff a bit at work and home. Just a few points to add.
You can reuse it, it works fine for around 6 - 8 uses.
More if you add more fresh ChipQuick & always use lots of flux.
Works best on small to medium size gull wing & all J lead parts.
You need to use a washing / squelching type motion to mix the alloy & the solder.
Just putting it on top of the joins is insufficient as it needs to mix.
Use a circular motion as you add solder, that causes the solder to pulse in & out between the pins a few times.
You still need to bring the part and the PCB up to soldering like temperatures before you remove the part, its just that when you do, you have around 10 seconds or more to remove the part.