I would say that any adhesion problems you're having between the flash & acid copper is due to surface contamination. I don't use SP degreaser on ANY white metal (aluminum, pot, etc.). Soft scrub works the best. And use purple nytril gloves. Latex or rubber will leave a film or deposit on the part and it won't plate properly.
I run my flash copper at 110-120 degrees, and acid copper at 75-80.
Dave
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