Actually yes I have. But I was not certain I would like it and didn't want to try and remove it later with any kind of solvent or scraping.
I actually used the Plasti Dip on my spare today. I taped off the edge I didn't want it painted to keep it somewhat two tone.
I didnt mount it but did place it up to the wheel to see if I liked it. First immpression was I didnt care for it. I am going to leave the color on the spare for a few days to see if I change my mind.
Here are a few pics.