Re: [ATM] New home built 12" ultralight dob

["Jim Miller" <jim@jtmiller.com>]

one caution on 3m77 is that it loses bond strength rapidly as temp 
approaches 120°F. 3m90 is good to 150°F. something to consider if you ever 
have your scope out all day at a star party.

jtm
----- Original Message ----- 
From: "Mark Holm" <mdholm@telerama.com>
To: <atm@atmlist.net>
Sent: Saturday, February 05, 2005 9:12 AM
Subject: Re: [ATM] New home built 12" ultralight dob


 It won't dry.  3M Spray 77 would probably be just fine
for this job too.  It has the advantage that you let the solvent
evaporate before you put the layers together.  Just use a light coat on
the foam core, because if the solvent penetrates the paper, it may well
melt the foam.  If one layer of foam core isn't stiff enough, laminate
two together to get 8 times the stiffness.

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