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  • I was going to give it a rub down with some acetone to clear off any gack, then glue over the whole thing.

    That would be my suggestion, if acetone does actually affect the old glue. If it does it is perfect, because the old glue will soften, and any rubbish stuck to it will come away with the cloth. ( piece of sheet dipped in acetone is best, in my opinion)
    Leave it till it stops feeling tacky and put on another layer.
    If acetone doesn't affect the glue it will effectively degrease it, and once dry you can carry on. In any case you should use the same type of glue as was used before, that is where some problems occur.

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