Re-setting dual-pane wondows?

Our living room window needed some work (the bottom sill was a bit rotted - I repaired it). I removed all three dual pane sections from it. I bought some black window putty (in roll form) to re-set the window.
My question: There was some type of grey plastic liner that surrounded the outer edge of the window dual-panes (it is like a thick poly plastic used for vapor barrier). It looked like this plastic was glued on with a type of contact cement. Should I put new plastic liner on? Is it necessary? Can I just apply the black roll of putty directly to the window and the frame?
Cory
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I mean "Windows" instead of "Wondows" of coarse (dummy)...
Cory

rotted -

the
of
I
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