How do I remove a failed Epoxy pour from a table top?

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I tried to refinish my table using "Parks" Super Glaze Ultra Gloss Epoxy. This is a two part epoxy and t had a problem with the pour. A good third of the table did not 'set' and remained tackey. The Parks company was very good with replacing the product, But I am stuck removing the failed pour. Sanding just loads up the paper in seconds. Please help.
Thank you.
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