Chemically, physically, lengevitally (is that a word?) polyurea is hands down the winner here.
I have done many types of roof coatings, and NONE of them stand up to long term watersoak (ponding) like polyurea. It is a true vapor barrier. Water does not permeate through it, unlike asphalt emulsions, elastomeric acrylics, etc. Those coatings are known as breathers, and breathers allow water vapor transmission, which leads to chalking and mil thickness loss in a short period of time.
Polyurea may be a little more expensive initially for a ten year warranted system, but you can get a 48 mil Average Dry Film Thickness membrane that outlasts the others, provides ample elasticity for metal roofing, will standup to indefinite watersoak, and, in fact mil for mil, polyurea is LESS expensive.
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Last edited by AaronB; 02-19-2009 at 10:49 AM.