My tub of Birkenstock cork sealer has congealed after 8 years in storage. Looks like they don't make it anymore. Is there any way to liquify it? 😳 : r/Birkenstocks
How To Seal & Clean your Birkenstock Cork Sandals -Jonny DIY - YouTube
4 Ways to Refresh and Protect Your Birkenstock Sandals – Schuler Shoes Blog
My cork is dry again. I used the cork sealant 6 days ago! How is this possible? Was my sealing job that bad?! Does this happen to anyone else? : r/Birkenstocks