Hot answers tagged glue
Although it can be done (I will share below), I would sincerely discoure you from gluing your LEGO sets. You will very much regret it later. Here are the reasons why: LEGO is meant to be a building toy - put together and taken apart many times. Once you glue a set it completely looses its usefulness and becomes nothing but another item to take up the shelf ...
MEK is the way to go - it's what the Masterbuilders at the LEGOLAND parks use. I once brought a miniland sized model from London to the US in my main suitcase that had been glued with MEK and the model was fully intact when I got to the other end! As others have said, it is VERY nasty when breathed in. Do not even think about using it in confined spaces ...
I use Kragle for putting together the Lego kits, but not any of the removeable pieces or the lego figures. I use a medium viscosity kind of Cyanoacrylate hobby glue. Just have to be careful to not get it on your fingers and your eyes.
Unfortunately older stickers are difficult to remove and reapply because the sticky part of the paper tend to rip off and leave a residue on the LEGO element itself. But the fact of the matter is that applying that taking off and re-applying even a new sticker is a challenge and it will almost always be visibly damaged at least a little bit. Your best bet ...
A better way to preserve LEGO is to put it in some sort of display case. It maintains the value and keeps the dust off.
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