Any drawbacks to "low temp" lead-free solder paste?

[Shrek]

An interesting experience

Recently got a secondhand Wi-Fi unit with most of the LEDs not working,
and found on the web that this happens for other people on this model.
Reflowed the LEDs with flux and they all came back to life.

Now comes the interesting part, a few days later they started failing again.
No surprise that they used low temperature solder for the LEDs, but surprised
that it didn't bond.

https://electronics.stackexchange.com/questions/24723/any-drawbacks-to-low-temp-lead-free-solder-paste

"I unknowingly purchased the ChipQuik solderpaste mentioned above. It is now sold as part number TS391LT50.
There were multiple problems. It didn't bond well to the pads, with solder lifting off the pad cleanly during hot-air
rework, leaving the pad as bare as the day it was born."

Have added a little normal solder to the joints and so far, they keep working.

 

[pavle]

Just use normal, leaded solder, unleaded just isn't up to task. Too many times it "gets dry" and cracks. Even the leaded does, but takes a lot longer.

 

[Shrek]

I agree, but I didn't get to choose, the unit came with this issue from manufacturing.

Seems they could not use leaded and wanted to avoid high temperatures for the LEDs