Definitely not the moulding process, gotta agree on the possible excess glue theory softening it over a period of time...
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I agree with Andy. It looks like the effect of cement on the inside surfaces, melting the plastic.
Already gave it a run over with a sanding stick and the dark paint hides a multitude of sins !are you going to try a recovery Karl. I would. whilst there is lot of surface damage, the basic integrity of the wing doesn't seem too badly warped or affected. I lot of filler and a lot of patience and you should be able to recover I think.
Thanks guys.Looking good Karl. Are we going to have an airbrush adventure soon?