This is what I do and it works every time, make sure you have the part polished and free from those white spots from the pits because that will cause problems. Get some maratic acid and mix about 4oz acid to 10oz of water and after you degrease the part take a brush and brush the mixture over the part until it turns grey and rinse and then go to your flash copper. Don't leave the mixture on the part very long.
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