After many years of tinkering around with reversal spray, I am proud to offer my own proprietary formulation of STS reversal spray with additional additives to help your chances of success. I am calling it “STS+”. 
Don’t be fooled by other brands who use cheap impure ingredients, and inconsistent mixtures. I only use high quality materials, and all of our STS+ products are mixed and measured with extra care using Class A, ASTM certified lab equipment.
Our STS+ product is available in “2 part concentrate (part A and Part B stock solutions)”, and also in a “ready to spray” solution for those who prefer no mixing, measuring, or diluting hassles.