I was planning to use vinyl dye, but it comes in a spray can and I wanted to take the grips off to spray them. Supposedly the vinyl dye will soak into the plastic and not rub off like the shoe dye. The stuff is about $7 a can at the auto supply store. It is also supposed to smell like heck until it dries, and I do not want to leave the bike outside until that happens. Sigh, it is when you try something new that you run into problems. "A problem is an opportunity in disguise", or so they say.