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Buzzer: are you using a pump to agitate the mixture, the clear polypipe? and if so are you feeding in air or recirculating the mixture.
My attempts at home brewed plating (just zinc coating with no passivate) whilst always managing to get full coverage always seemed to end up with a grey furry texture which required to be lightly polished with a scotchbrite pad but even then a dullish light grey uneven coloured finish.
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