1) Go to Sam's Club and buy heavy work gloves (the ones with wrist cuffs) one extra size larger than your hand.
2) Go to any camping store and buy bees wax.
3) Apply 2 to 1
4) Comfortable, waterproof, durable riding gloves that will last for several years.
Of course, I also insert a good ol' baseball cap (without back snap) backward in my helmet for a helmet liner, ride in heavy denim overalls and high-top tennis shoes, and if it rains I sometimes wear a cheap two-piece rainsuit from Walmart (usually I don't bother-- hell, ya dry out in a few minutes anyway). Got no use for fancy leather and chrome, or ritzy expensive 'name' clothing-- I'm guess I'm just a good ol' bubba-boy rider, but I'm comfortable and still got money in my wallet!
You can go with expensive motorcycle-specific over gloves, or go to pretty much any hardware or farm store (like Tractor Supply) and buy plain old heavy duty rubber gloves. My experience is they work just the same.
I am neither sugar, nor salt. In even heavy rain, I don't get wet unless some idiot in front of me slows down way too much. I guess my hands have have gotten wet while riding, but I don't recall such specifically. Mind over matter, if you don't mind, it don't matter. Mechanics' gloves do dry very quickly if they get wet, I suppose. If I were going to wear a water proof glove, I probably would select the ones made for brick masons who use muriatic acid to clean excess motor from their work; similar to the ones made for dishwashing, just tougher.
I usually don't wear rain gloves but it was so cold and wet, I had to get something for my hands, they were sore and cold from the rain and I was wearing ICON leather gloves that were just drenched.
These are hands down, the best gloves I have ever worn in the rain, they are water proof, warm and very comfortable. Thinsulate lined with a neoprene cover and the padding reduced some of the vibration and I couldn't even feel the rain hitting my hands anymore.
Stop at a truck stop and buy some rubber gloves fro around 5 bucks.
The key is to keep your hands dry. I did a 5,500 mile trip last month with at least 500 miles of rain and my truck stop gloves worked great.