Jean-Jacques,
 
Thank you for your helpful response concerning UV blocking window film.  I am
currently dealing with a local contractor for Llumar films.  You are right
the 7 year guarentee is for cracking, de-metalizeng and delaminating of the
film.  It is not a guarentee of its UV blocking performance.  I have been
told that the UV blocking ability of the film and adhesive decreases aprox.
5% every two years.  I have just called the dealer and asked for this
information in writing from the company.  I will send you the address of the
company as soon as I receive it.  Thank you again for your assistance-you
encouraged me to ask questions I might not have thought of without feedback
from others.
 
 
Edith Serkownek
Warren County Historical Society
Warren Pennsylvania