I've been using McKee's Tire Coating along with McKee's 37 Tire & Rubber Rejuvenator since 2016. I get about 3-4 months before needing to re-coat on 2 daily drivers.
Durability - 5
Shine - 3 (Based on 2 coats and tire type)
2nd this!
I also use MK37 Tire Coating. Works pretty darn well.