Off white?!?!?! I guess white was a little too bright, huh? Yeah, you're pretty much fucked. Try stripping it off, but if the paint isn't setting/drying (that's why it's sticky) there is nothing you can put over it to fix it. Next time use dye that is made for vinyl, you can get good stuff to mix in a gun, or even the cheapo stuff in an aerosol can will do better than paint. Of course you could just leave it alone, but from reading you posts, I don't think that's an option, is it?

 

I painted my tires once and had the same problem. You have to prep it really good with steel wool and paint thinner, I always drink a little first to make sure its right, works every time.

I'm sure if you make another 3 or 4 posts about it you'll get some good answers.