Some Cyanoacrylate/CA-glues contains acetone, wich may eat some plastics.
The ones that are considered safe for use on EPP, styrofoam, depron and the likes are usually all marked with "foam-safe" or "odorless", but this alone does not guarantee it will not attack some materials, so use caution and always test on unused piece of material first.
With the Pleo, though, it would be difficult to find unused bits of skin to try on ...
Most model aircraft stores would probably know about and carry foam-safe glues.
Cheap superglues bought at the supermarket with little or no ingredients-list are probably not suited for this task. They might be, but best not chance it.
So, to sum up:
- If a glue does not have a complete list of ingredients, I would not use it.
- If it contains acetone, I would not use it.
- If it does not specifically say "foam-safe" or "odorless", I would not try it.
Also, using lots of CA will generate lots of heat as it binds. Moistness (or specially designed "kicker" or activator-spray) makes it bound quicker, that's why it will so willingly let you instantly glue your fingers together. Kicker may be necessary when gluing very dry materials.
The heat generated is probably not enough to cause problems in most cases, but it's worth thinking about. One por guy accidently squeezed a CA-bottle too hard, trying to get the glue through a jammed tip, and the bottle cracked open in his hand, pretty much instantly giving him not only a rather glued up hand, but also burns ... not too nice.