A bizarre question......................

[PaulTRose]

theres two knacks with using ca with transparencies

first is to use some Johnsons Kleer (or humbrol equivalent).........acts as a barrier
second is, its not the glue that causes fogging.....its the fumes........so put a little splodge of ca on a bit of card and leave it for a few minutes for the fumes to 'evaporate' then use a toothpick to add the smallest amount needed

dont blame me if it goes wrong lol,......but it works for me

[Bugatti Fan]

I have used slower setting epoxy, but it has to be used very, very carefully placing minute amounts from a cocktail stick.
PVA is much more forgiving, and many like to use it.

[Flip]

As the guys above have suggested, I trawled the suppliers trying to get Microscale's Liquitape.
The problem is that the importer doesn't bring that product line into the UK.
I tend to use the Microscale Kristal Klear. It is, in effect, a PVA glue.
Apply using a cocktail stick.
Very controllable. If any oozes out of the join; lick your finger and wipe while the glue is still wet.
It really does work and there's absolutely no fogging of the transparencies.
Got my son onto it too.
Regards,
John