Buff or polish the aluminum surface to a bright shine. Wash with a mild detergent and do not dry. Apply Aluminum Cleaner by dipping or brushing it onto the work-piece. Note this is not an electroplating step.
Rinse with clean water and without delay dip or brush on the Zincate Solution, you should get a light gray coating on the aluminum.
If the coating is not even or has places without color. Cleaning and re-zincating is required. This is not an electroplating step.
To activate/clean the aluminium prior to zincating, some people use diluted lye
Maybe the problem is improperly cleaning/activating your aluminium surface before the zincate step.
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