Did you use leaded or unleaded solder?
Not that this makes any significant difference...
Leaded solder is more tolerant to difficult surfaces.
Generally soldering with unleaded solder needs higher temperatures and more skilled user.
I think those are enough differences worth to mention.
I think everyone agrees that leaded solder is objectively superior. But I think the difference is far, far smaller than people claim it to be. But above all, no matter what the core problem is (be it a difficult surface, or insufficient heat, or whatever), the fix for each problem is the same whether it’s leaded or lead-free solder: prepare the surface better, or use a better flux, or add more heat (depending on the problem).
Having literally taught groups of beginning solderers, I honestly just can’t agree that lead-free requires significantly more skill than leaded. The skills needed to be a good solderer with leaded solder are the same skills needed to be a good solderer with lead-free solder: understanding heat, timing, and observation of the workpiece.
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