My favorite sets of pliers all have a rubbery surface on the handles, making them easy to hold onto while saying rude things to hardware. Ours came that way, but you can use Plasti Dip to add that same grippy surface to nearly any object you want.
Tools are an obvious choice for coating, since holding firmly on to them is critical no matter you’re doing. But a host of other possibilities come to mind if grasp impairment is an issue. Silverware a little slippery? Dip the handles. Juice glass hard to hold? Dip the lower half. Plates a challenge? Dip the edges (and the bottom, to keep them from sliding). Coffee mug inclined to slide? Dip the bottom. Pencils, Pens? Paint a strip of Plasti Dip where fingers go. Dip the handles of scissors, paint the undersides of rulers, dip the handles on crochet hooks, knitting needles and other craft tools. And so on.
The can says it can be used on virtually any surface: “metal, wood, glass, rubber, concrete, fabic, fiberglass, rope” etc.. The directions call for tying the object to a string, and then dipping it into the can, but the fluid can be brushed on as well. There’s a spray version, too.
Plasti Dip comes in blue, yellow, red, black, white, and (wonderfully) clear. Caswell carries all the colors online. Your local big box probably doesn’t — ours only had the red and black, which I found in the paint department at Home Depot.