It's right what you've read about Future (Klear in UK) Matt. It's amazing stuff, and will stop Superglue hazing/fogging. It's not the glue that does the damage, unless it gets smeared on the area where you don't want it! It's the fumes that react, causing the fogging. This can be cleaned by polishing with an ammonia based cleanser, window cleaning fluids being ideal. The problem is, if it happens on the inside, and the canopy/ window has already been glued and set....
But, dip the parts in Future. I reccomend that you put a length of masking tape on one edge first, making sure it's doubled back on itself so that it won't stick to anything else. Put enough Future in a suitable CLEAN container - cup, bowl, whatever, then, holding the part by the tape, dip it into the liquid, ensuring it is totally submerged. Lift it out when you can see, through the liquid, that any air bubbles have gone. If they still there, just move the part around to release the surface tension.
Have a suitable dish or bowl handy, with a cover. (A casserole dish is ideal, but don't let the wife know!), lined with kitchen tissue. Let the excess Future run off the part, then place it on edges on the tissue in the bowl, and cover, leaving a gap for air to enter.
Do NOT touch the part. The cover is to prevent dust adhering to the drying Future. Leave it for an hour or two, and the excess Future will be absorbed by the tissue, leaving the part smooth, sparkling and clear; probably better than it looked new! The Future is self-levelling to an amzing degree, and will prevent 'Superglue' fogging.
To fit small windows, as on the SR71, use a toothpick/cocktail stick, and just run a thin bead around the frame/opening, then insert the clear part. You can hold this in place for the few seconds it takes for the glue to 'grab' the part, but again using a cocktail stick, with a small ball of BluTak (poster putty?) on the end, with the 'window' just lightly pressed onto it. Then. gently pull back the stick, and the 'window' should remain in place.
For decals, Future works very well, even by brush. One coat will give a sheen in between full gloss and semi-matt, two coats will give gloss. Brushing is not a problem; use a relatively broad, soft brush, slightly bigger than you would for a paint job on the same area. (i.e. a Number 4 where you'd use a Number 3) and brush on smoothly, in one direction, until the area is covered. If there are any build up of Future at , example, trailing edges, use the EDGE of a piece of kitchen tissue to absorb it. Do NOT touch or re-brush the Future once applied, no matter what it looks like. It is amazingly self-levelling - any bubbles and brush marks should disappear once dry. Leave, preferably overnight, before decaling in the normal way. IF there are any brush marks etc when dry, a second coat, procedure/time as before, WILL cure it.
You will be amazed!! The good thing is, it's a household product, in 500ml bottles, at household prices. If it was a dedicated modelling product, a small bottle would cost more than the 500ml !!!
Hope this has helped, happy futuring (OK, Klearing in the UK!).
Terry.