When it comes to tire shine, this is where I am the most critical with. If something has sling or the wrong silicones in it and my paint gets messed up with blotches, I will have a bad moment.
So far, z16 has always impressed me and has never given me an issue. All of my customers love it too.
I am very happy with the Black Magic stuff right now. I use botht the Matte and the Wet Gel and haven't had any "sling" problems at all!! Just follow the directions and everything is cool!!
I have also used OB applied with airbrush and haven't seen any sling either!
I have had good luck with Meguiar's NXT Insane Shine aerosol spray dressing. I do let it sit a while after spraying it.
It may be a bit shiny after the initial application for some peoples taste. But the high gloss is usually removed with the next wash leaving a nice looking tire finish that lasts a few weeks.