Jim, below is a re-post of one I made on the power tool forum a few weeks ago. It was entitled "Improving clamp handles". Try it where it is needed. I think that you will find it more convenient than a nitrile glove, which is a temporary fix that you need to put on and take off ....
I have had a bunch of old Bessey parallel clamps forever. About a year ago I purchased a few of the Bessey Revo. What I came to appreciate about the Revo are the soft grips - they are so easy to tighten and loosen. By comparison, the red-painted wooden grips of the old Besseys I have are slippery, which can be quite frustrating.
I tried a latex spray on the painted handles, but it was not durable and peeled off.
I recalled a thick silicon tape I had used to repair pipes. It seals by welding to itself.
Wrapped around the handle, it takes about an hour to become permanent. It is very grippy and comfortable. A definite upgrade for any clamp handle ...
Regards from Perth
Derek