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If you are using plasticweld and you seal it in then it doesn't evaporate and tends to cause the warping as it continues to eat through the plastic softening it. It's effectively resealed in its bottle by the glue around the outer edges.
If you want to use plasticweld or other liquid glues I'd suggest drilling small holes on the inner sheet that will be hidden and just putting drops in each hole so that it glues the plastic together and then the solvent can still evaporate.
If you want to laminate it all over the sheet then you'd probably be better off with a contact glue rather than one that relies on evaporation.
 
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