It's a website selling dubbin - and if you read it, the product description actually states "It is very good at keeping leather healthy and good for many uses, but does not repel water."
I also found a few sites recommending not dubbin at all, but beeswax.
So I dug out the tin of beeswax that came with my expensive Ducal furniture (20 years old but still looking good) and used some of it on one pair of boots.
I've done another pair with vaseline, as that seemed to be better than the (useless) dubbin.
I've left both pairs for it to soak in overnight, as recommended. Apparently that might be part of my problem, I tend to apply the dubbin just before I leave for work, and it seems as though it needs a little time to work its way in. Although Pappy's Dubbin does clearly say that it doesn't repel water, so it might not matter how long I left it to soak in.
We'll come back to this issue in a few days....
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