At 15:56 7/4/01, Bruce Kolber wrote:
Has anyone tried the cement sold in auto stores for reattaching the rearview
mirror to the windshield?
Bruce Kolber
St. Petersburg, FL 33715
USA
The stuff I've seen for this is "two stage" with an application of some
really runny stuff before applying the adhesive. Based on my experiences
with using it to put two rearview mirrors back onto windshields, I'd be
very reluctant to use it in (or on) an OM body.
If there's some other version of this that's much easier to control in
minute application (and would not chemically damage anything) it might be
some good stuff. The reason "super glue" does not work as a rearview
mirror adhesive is "coefficient of thermal expansion" mismatch. The metal
slug and windshield glass expand and contract at much different rates when
heated and cooled. Cured "super glue" is too brittle; the "CTE mismatch"
eventually fractures the bond (usually within days or weeks). Automobile
rearview mirror adhesive is slightly pliable when cured and the layer of it
"gives" (flows slightly) under this stress.
The reason I mention this (metal and glass CTE mismatch) is it could easily
be a failure mode for the adhesive between mirror and frame. Yet one more
reason not to let your OM bake inside an enclosed car (or SUV) at
mid-afternoon during mid-summer. Also another reason _not_ to try to thaw
one quickly if you're bringing it in from severe cold weather (about 20F
and below). High thermal extremes and thermal shock is not good for them.
-- John
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