Lippy and PridenJoy:
It is not a stencil. I simply painted the raised lettering on the tire's sidewall.
I traced the letters/logo first with a Sharpie brand
oil based paint stick. After a few passes, I finished with a few coats of yellow paint. I had some left over yellow paint from my tow eye project. I do not know what this paint's name or code is, but I assume any yellow that you like would do.
I tell you what, though. I am sure many of y'all have the gift, but it took a LOT of patience and trial-and-error. The products I had at hand simply would not stick to the rubber! I did not bother to find a better paint product. I hope it does not wear off quickly. Otherwise, I will have to find a long weekend again to re-do it.
Cheers!
Hector