R22 Discussion Group

Ed,
NP-1 is normally used to seal metal parapet wall caps. These often move  
substantially, so the product has to remain flexible for up to twelve years. At  
least that's what the label says and it's worked extremely well under adverse  
conditions. Sherwin Williams also has a one part urethane that works well.

Rummy

In a message dated 3/22/2008 1:05:49 P.M. Eastern Daylight Time,  
ekroposki at charter.net writes:

Bob,

That was direct to the PDF, here is how I got  there:

http://products3.3m.com/catalog/us/en001/auto_marine_aero/marine/node_GSWWSBSW
85be/root_GST1T4S9TCgv/vroot_GS4JK4Y166ge/gvel_QH8HT14PGTgl/theme_us_marine_3_
0/command_AbcPageHandler/output_html

Anyway,  as you may be aware, Captain Rummy uses a product that he uses and
has  experience with in roofing:  NP-1

It is a one part urethane.   I was reading the label on an old tube of 5200
and it said one part  urethane.  It certainly is different from what Rummy's
product  is.  5200 is glue, and gets very hard.  Boat makers use  it
extensively to secure things.  The problem is its lack of flex on a  boat. 
As fiberglass decks flex they cause cracks with 5200, that cause  leaks.

I knew that 3M developed 4200 to deal with that issue.  So  I tried to get
some technical answers as to differnces between:  5200,  4200, LifeSeal, and
NP-1.  I am not Roger P., so I am stuck with what  is on the labels. 
Apparently all the mentioned products are Urethane  mixtures of some type. 
For different purposes we need to use different  products. 

And my brief study does not get into silcone, silcone II,  neoprene, etc. 

Anyway, the page I posted is hard to get to on the 3M  site.  You would think
that would direct you to it in oriniary  English, but you have to try the
exact terms before you get to it.

I  use Rummy's product.  It has remained flexible on seams for two  years.  

Ed K
Greenville, SC,  USA
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