Polyamine Cure vs. Polyamide Cure Coating

Amine based curing agents are considered to more durable and chemical resistant than amide based curing agents but most have a tendency to 'blush' in moist conditions. Blushing produces a waxy surface layer on actively curing epoxy, the result a reaction with the curing agent and moisture in the air. Other potentially toxic chemicals within the curing agent can also be released in the same manner, thus amines are often viewed in light of these potential shortcomings.

Amides, on the other hand, are more surface tolerant and less troubled by moisture.

http://www.epoxyproducts.com/chemistry.html

So basically use the amide if it's humid.

Otherwise, use amine, as it will give you a more sturdy coat.