This is interesting, not sure which other glues are affected like this, I presume it is the glue that is softened in time.
From the Timebond Data Sheet:
LIMITATIONS
• Evo-Stik Timebond is intended for interior
use, but can be used in exterior locations
protected from the weather, such as for
laminates bonded to shop fronts.
• It is unsuitable for use with sensitive surfaces
such as expanded polystyrene, cellulose
painted surfaces, bituminous surfaces.
• Do not use Evo-Stik Timebond with vinyl or
plasticised PVC as it will soften in time.
• It will not bond well to polyolefins such as
polyethylene, polypropylene or teflon.
Just remembered that I Evo stuck some sleeping roll, the thick black ex MOD type to the roof of Forceful to stop my head exploding in the summer, had a look at the bit that fell of a while ago and the foam is unaffected though the glue has mostly come off it, leaving a clean surface.