Is it the board that is blistering or the solder mask? If it is the board
try baking them. It could also be of course just a bad batch of boards
that can not be fixed.
Ken Kirby
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Subject: [TN] PCB blistering during wave
Fellow technetters,
we are presently fighting with some ultra low-end TH only PCBs. During
waving they blister a lot. We tried many things like hotter-colder
preheating, hotter-colder solder temp, faster-slower speed. No result.
Are there any other tricks to try, or we send them back to the fab?
Thanks, Ioan