On a positive note, I'd like to thank whover pointed me towards Meg's Hot Shine for tires. It might be a bit greasy to apply but I've had no slinging and still looking great on all 5 cars after about 3 weeks. I've tried quite a few, but so far this product wins hands down!
I agree with DLW. Very nice product to use. Very slick, black, gloss that lasts even after 2 thunderstorms. I have previously been impressed with Eagle One's WET, but this is slightly better.
I am still getting a very nice black look after almost 3 weeks. The Zaino stuff I used to use never looked as good even right after applied and lasted less than a week when I used it.