"Temporary" glass installation

[Fred n' Ethel]

Hi folks. A search revealed much about glass, but I didn't see what I'm looking for.
I have new glass and rubber for the windshield and back of my 54 3100 as well as a 39 sedan. They are both drivers and in pretty good shape. I might restore one, or the other, or both in the coming couple years but for now I need the new glass to make them street legal. And safe. The 39 is really bad, 50% delaminated.
Can I put these new glasses in with NO adhesive or sealer assuming I'll be pulling them out in the future for the restorations ? Would they likely leak ?
Never plan to ride in the rain, but might get caught out, ya never know.
I don't want to ruin the rubbers, is the glue/sealant permanent ?
The original 39 glass was a pita to get out .. glued tight everywhere.
Thanks,