[ATM] Flex mirror glue source, glue idea + secondary mirror choice

[Gil McFarlane <gilboastro@yahoo.com>]

 Thanks for the thoughtful comments about secondary
mirrors, I'm buying a quartz one for the flex scope
I'm finishing - figuring that I'm making most
everything else, so how often can I "go all out" and
only spend $140.  (Actually, I'm practicing that
rational to try on my very lovely wife.)

Also, for those considering a flex mirror and having
trouble finding a two part polyurethane that sets
slowly, I finally found one that is easily accessible.
 (The one that Adler mentioned is very difficult to
buy in small amounts.)  This one is listed at McMaster
Carr, it has a pot life of 20 minutes, and only costs
about $6 for 1.6 oz. (# 7448A23).  Technical details
on it are at
http://www.freemansupply.com/Araldite2040Polyur.htm. 
Seems to work well!

Also, for those looking for interesting glue ideas,
(and who isn't?), there is an interesting article at
http://www.nasatech.com/Briefs/May04/NPO30737.html
having to do with mixing silicone with two part
polyurethane to get a more flexible, but still strong,
glue.



- Gil


		
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