My tub of Birkenstock cork sealer has congealed after 8 years in

These are only 9 months old but there are chunks of cork falling out

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Birkenstock Cork Seal

These are only 9 months old but there are chunks of cork falling

Care and Repair - Complete Birkenstock

Birkenstock Cork Sealant : Industrial & Scientific

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How to Seal Birkenstock Cork

These are only 9 months old but there are chunks of cork falling

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Help! Birkenstock cork starting to deteriorate. Only 12 months old