Bad Boy Salve is a water-based, non-toxic, concentrated silicone emulsion formulated to protect, shine and seal surface cracks on any rubber surface. The salve is applied much like an ointment used on your skin. The brush and rag in every Salve Kit are used to direct the salve to areas on the rubber surface where it is most needed. Boy Salve is ideal for use on ALL SIZE rubber tires to enhance and control surface cracking and improve ozone and UV protection. The protective properties of Bad Boy Salve are most obvious on tires that sit idle for long periods of time.