> Over time the two surfaces become more intimate, and the adhesive
> builds in strength. Therefore, the longer it's there, the harder it is
> to remove. My guess is that the cross-linking also boosted the
> chemical resistance, hence the reduced effect of solvent now.
That probably explains some smoke-color Plexiglas that I was given years
ago. It had brown paper glued to it to protect the surface; which is now
impossible to remove. The adhesive is literally stronger than the paper and
so far, has stood up to every solvent I've tried (including some that damage
the plastic).
-- Randall
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