Kemper or approved equal sounds like a smart move to me; get their local reps to come out and see what they recommend as to product and substrate preparation, so you're not on the hook for the material selection and prep.
 
My first thought was to patch with some sort of (probably ferrous) metal.  Your roof may be terne-plated steel or more likely terne-coated iron plates; my guess would be iron, based on thickness (I've never heard of 3/8" thick metal roofing), and put a magnet on it to confirm that it is ferrous.  But Eric is right about the possibility of overheating and burning the place down from brazing, soldering or other heat-based attachment process.  And if the plastic membrane turns out to be NFG, God's chilluns can scrape it off again and try something else.
 
What sayeth Twybil?
 
Keep us posted.
 
Ralph



-----Original Message-----
From: Hammarberg, Eric <[log in to unmask]>
To: [log in to unmask]
Sent: Sat, Sep 11, 2010 4:25 pm
Subject: Re: [BP] working closer to God

I would suggest looking at liquid applied membrane such as Kemper or Liquid Plastics. They last a long time, bond well to metal and self terminate. Minor undulations can be accommodated and deeper ones filled with wood and fared with a mix of liquid and sand. The stuff sets up quickly as they are MMA based (like super glue)Color can be limiting. (I doubt you want to weld or braze! Lest you become another infamous "burning down god's house" contractor.)
Thanks,

Eric Hammarberg
Vice President
Thornton Tomasetti
51 Madison Avenue
New York, NY 10010
D 917.661.8160
F 917.661.8161
M 917.439.3537
[log in to unmask]
www.ThorntonTomasetti.com

This message was sent from my PDA, please excuse misspellings or similar mistakes.

From: The listserv where the buildings do the talking <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Sent: Sat Sep 11 15:09:54 2010
Subject: [BP] working closer to God

Local historic  Mississippi church with tower  stucco problems
caused by leaking turn of the century hard pressed metal roof (not copper )(early galvanized?)
 rusting from what appears as inside out. (showing stain)
Metal is 3/8 thick and difficult to bend  with pliers even where its rusted
Budget is not large and while we don't specialize in metal ; we have advised they go back with metal patches over large holes and patch small ones  ;but what other patching compounds or epoxies are out there that they should be looking at  
working closer to God ////Py

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