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Problems with switches soldering

1461 1 May 16.2019, 18:10:39

I'm using GC10 lead free paste and pupulate boards with fair number of switches.
For some reasons some of the buttons are not soldered at all even though the paste fully melted. The leads are kind of sitting in an indentation of the pillow if solder in the end. Sometimes they just not connected at all and can be removed with no effort. 
Should I switch the paste?

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