As so many others have suggested bare pads with lots of flux is the way to go.
I would in addition as a first step also brighten up the pads with “Scotch-Brite” scouring pad to remove any stubborn oxidations.
Bertho
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RE: [Homebrew_PCBs] Soldering a LQFP 48 on a home made PCB
2014-11-08 by Boman33