McKee's 37 Tire Shine is enhanced with silicon dioxide (SiO2) to form a long-lasting barrier of protection on your vehicle's tires. Designed to prevent long-term damage from exposure to the sun, Tire Shine SiO2 Enhanced creates an attractive semi-gloss finish that will not sling off. Use McKee's 37 Tire Shine SiO2 Enhanced to protect and beautify brand new tires, or to restore a rich black appearance to older tires. Frequent application will protect your tires' sidewalls from cracking and turning brown. This solvent-free formula dries 100% to the touch.