Peter:
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I'm using new formula copy cad solution at 30 centigrade (88 fahrenheit)
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The new formula calls for 110ºF. I have never tried it at less than that, so can't say how much of a difference it makes.
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but I'm looking for a dull cad type finish on the larger items anyway
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In that case, even when it has plated correctly, parts will be dull gray, and you'll need an acid dip to turn them silver/white.
Heres before & after photos, w/out brightener:
Before and
After
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Used 1.12 amps for a part that was 8 square inches
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That's right on for the new formula.
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Acid dip is 5% hydrochloric.
How long should I expect to dip the part to remove the grey foam that grows during plating?
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That should do it within a few seconds! The change in color is quite obvious (if it's plated properly), and you just leave it until it stops changing. In my cases that's never more than 5-7 seconds or so. I've never actually timed it.
Sean