Well...I have 8 of my cels framed so far, and I 
plan on getting the rest slowly done.  

I see no problem with framin your cels.  
Shoot...Some even say framing archives your cels 
better, and they can last a lot longer.

No matter what you do your cels will degrade over 
time.  You wanna make sure everythin g used is 
acid-free, and the glass is UV protectant.  

When you display your cels in their frames...Be 
smart...Don't put them next to a window, or in 
direct sunlight all day ^.^;!

You can always ask your PROFESSIONAL FRAMER the 
process he'll put your cel through...So you will 
know exactly what you're getting your cel into, 
and if you want that technique to be used...etc.

Sorry...I would write more in depth, but I've 
gotta run...Here's a few framed cels of 
mine...O!  And it would also be wise to get the 
cel raised off its background!