You probably weren't yet here too.   Well, this will be an exercise in searching the B-P archive if you are that interested.

I decided on the acrylic elastomer route.  Lot's more dough for material up front, but performance is hard to beat.  Prep money is the same regardless, so I consider it an investment for the long term.  It's just surface rust (that photo is only 4 years old), so I have no need for the reinforcement.
____________________________________

Dan Becker, Exec. Dir., RHDC
Raleigh Historic Districts Commission
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-----Original Message-----
From:   John Mascaro [SMTP:[log in to unmask]]
Sent:   April 6, 1999 12:11 AM
To:     [log in to unmask]
Subject:        Re: Obsession

>Roof material is [now] rusting standing seam terne metal.  An earlier thread
in the archives discusses the failure of my paint film >

Missed this tread!  What solution did you decide on.  (I've used reinforced
acrylic elastomers countless times on such roofs w/ great success)

John Mascaro