If an inner-tube can be used to rubberize a BIC lighter, why not a knife?
One of the pesky traits of the wooden handled Mora knives is their lack of grip when wet. One could acquire a Mora with a rubber handle, but, let’s face it: those are ugly. Instead, I cut a piece of 700x35 bicycle inner-tube about an inch wide and slide this just less than halfway on to the handle. The grip is immediately improved. If you were so inclined, you cut a piece the length of the handle and cover the whole thing, but so far it seems that this small piece is enough.
As with the rubberized BIC, this also provides another way to carry tinder that will work even when wet (though it will require a lighter or candle to start).