No. Most of the construction is nomex anyway, so not waterproof.

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I'm not the most up on leather care, but in general I've always been recommended to use wax-based treatments like sno-seal rather then animal based products. I've been told that animal based products run the risk of over-softening leather, which is the last thing most thin nomex/leather gloves need.

I've used heavily sno-sealed gloves around open flame for years with no issues, so I wouldn't be concerned.

That is just use. Snow seal is a sealant and not a conditioner or oil. In general you want to condition/oil then seal. Just sealing can cause the leather to dry out. However, I have never used anything on contact gloves. I don't expect them to be fully water proof, nor do I want them to so they breath better, and I have never had a pair where the leather got dry. I have oiled then snow sealed leather work gloves, but that was for use on horses and motorcycles where I was looking for waterproof.

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