Here is a tip for anyone using Metal Frames...
DO NOT USE THOSE METAL BOW CLIPS ON THE BACK OF THE FRAME! There are MANY reasons for this. First off, if you are using 2ply board..overtime they will but a bend in the matboard. Second, they are a pain in the ass to remove and will sometimes even break the glass if you try to pull a side off the frame and the clip pops down and hits the glass. Third, they create a space for bugs to craw into ect.
After you have your print framed completly, cut strips of old matboard (4ply, or a few layers of 2ply) to be fitted into the space where the clips will usually go. You can fit it in there very snug...but it can be removed easy. Also, it seals off the back of the frame to stop dust and bugs from going inside. Doing this will also leave no bend/bow/damage to the mount or frame. When the strips of matboard are fit in there snug, there will be no uneven presure on the mount to cause the overmat to lift in certain areas.
If you do this, dont worry about putting backing paper on the frame or anything like that...it is not needed.
As for glass, I use glass only, not plexi. I am very picky about glass and try to look for the higher quality that does not have a color cast on it.
I would not be taping off the back of the framewith random tapes. It does not look clean usually, and it is not needed. If you take my suggestion on using the strips of matboard to replace the metal clips, it is also not needed.
Ryan McIntosh