In reply to peebles boy:
I think the fundamental problem is that the body of the glove is basically fibrepile, so has a very open structure. And, no matter how much proofing product you dunk it in, the gaps between the fibres will be so large that the proofing will not provide enough repellent force to hold the water out.
The plus side is that, as with all pile products, water drains out easily. Except in the bits covered in nitrile foam, which will remain filled with water...
What's really needed is a pile/pertex Argon, with a pertex shell on the exposed pile section...
I found some thin nitrile-coated work gloves the other day, with a knitted nylon body replacing the pile, and thinner nitrile coating... £2 in TKMaxx...