"Stupendous Man" wrote in message
...
Silicon sealants exude acetic acid, causing rust and that's why a butyl
compound is used for auto glass installations.


yes, and the urethane is MUCH MUCH stronger - if there is interest, I can
explain, suffice it to say for now that I've used both on a large piece of
glass and if done right the Urethane is amazing



** Posted from http://www.teranews.com **