I just used some black electrical tape! It's really flexible and can strech around bends easy. Be sure to scratch up the crome or the paint will just fall right off. When mine were done they looked better than the factory, if you've ever seen a clean set of factorys you've noticed that they too needed a stencil kit!
Been there done that. I do powder coating and would like to do wheels for others that would like theres restored Its too time consuming to tape them espcially if im doing multiple sets. Id rather spend a little money on a stencil kit.