I've used this for years on Nubuck and suede boots (from new):
www.philipmorrisdirect.co.uk
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Nikwax Nubuck and Leather Suede Proofing
The Nikwax Nubuck and suede proofing is water-based waterproofing for nubuck and suede footwear. This product is recommended for use on Gore-Tex and Sympatex footwear. Can be applied by either spraying or sponging onto wet boots to provide highly durable water repellency.
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