Expired Polacolor Pro100 problem

[Ramiro Elena]

I've got 5 boxes of Polacolor Pro100 expired in November 2002, this is good.
The bad:
I load the film in the 545 Polaroid holder, pull back to reveal the emulsion but it stays covered. I have to pull quite hard as if the metal part of the sheet was dry or stuck to the emulsion... well in fact it is because I can't get it to reveal it.

It is the film. I have tried a couple Polaroid backs which have always worked.
Does anyone know of a trick or procedure to soften the sheets or make them work again?

It is a shame to not be able to use all this film.

[Gene McCluney]

The metal end-clips on late issue Polaroid 4x5 individual sheet packs are inferior, and I often had them deform rather than releasing the outer sleeve for exposure. I was able to work with them by lightly bending them more open, before inserting the film into the holder.

[Ramiro Elena]

Thanks Gene, I'll try that and see if I can recover all that film