Hey Frankie,
I searched the Raber Glove site but found no information on the care of their products.
So I did a search on waterproofing leather and ended up back where I started, at Atsko Sno-Seal waterproofing.
Here are a couple of well written/researched reviews from The BackpackerGearTest site:
http://www.backpackgeartest.org/reviews/...Field%20Report/http://www.backpackgeartest.org/reviews/...Field%20Report/The Astko website can be found here, they have many types of clothing/footwear treatment products.
http://www.atsko.com/products/waterproofing/sno-seal.htmlStandard Disclaimer here: I have no connection with Astko, I just ended up with a BIG can of there Sno-Seal product many years ago and have been happily using it ever since.
Mike