if u think humidity might be a cause - try drying the boards in an oven for 20
minutes at 250F . Then try cutting out a section and perform a solder float
test - floating coupon in a solder pot. If you get blowholes - outgassing -
would start sectioning boards and looking at copper walls in general - it
might just be ur boards.


Regards

Richard Fudalewski
Atotech Canada

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