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HELP! Copy cad/ zinc plating with yellow chromate

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  • HELP! Copy cad/ zinc plating with yellow chromate

    Got the 4.5 gallon kit and have been fighting getting the yellow chromate to stick. After wasting 2 full working days with no success I called tech support and there manual is written wrong. You are not suppose to use muriatic acid before the chromate. That was my first problem.
    The guy on the line said to dip them into sulfuric acid before the chromate, this helped a little bit but the yellow is still not sticking still
    Is there something I’m missing or doing wrong. Here’s my steps.

    All parts were sonic cleaned,
    then sand blasted,
    Rinsed free of blasting material
    then sp degreaser 20 mins
    Muriatic acid dipped 2-3 seconds
    Spray test
    Plated 20-30 mins
    Sulfuric acid 10-15 seconds
    Rinse x 2
    Yellow chromate approx 1-3 mins to achieve color air dried for 30 mins and into the oven for 1 hour at 100 degrees