Solder won't flow nicely on some PCBs

I recently bought lead free solder and I noticed a significant difference. Leaded is much easier to use. I use a Pace set at 700F and I never had issues. The unleaded stuff sometimes looks like it’s not flowing but then the resulting joint looks fine so I don’t know what to make of that!
 
Solder flow issues are almost always due to a lack of heat. If you're using lead free solder start with your iron at around 350C and go up from there maybe to around 450 if the solder doesn't melt within one second of touching to the iron and components.

Also a thicker tip transfers heat better, maybe try a 2mm
 
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