Chic,
It has been my experience that the "Amine Blush" is usually caused by incorrect mix of the resin/hardener and/or a low temperature. The "Blush" is water soluble and can been removed with a dampened Scotch Brite pad and a paper towel cleanup. I mix my West Systems epoxy using their pumps and select the appropriate hardener according to the ambient temperature. For smaller batches I measure by weight and use a gram scale. Each component is weighed separately, in a mixing cup, then blended together, at least twice- from one cup to another. I'll have to try the cornstarch method also and it proves that you're never old enough to learn something new. BTW, the other contributors on this thread are true experts in their fields and "good guys" also.
Regards,
Art