If you don't know Formula 303 SEALANT/Shine, you should. Contains plastic and rubber much better than any other product available. When used new, inside and out, and regularly changed every 3 months, a 3-fold increase in the mileage of your tires is normal. I've seen 156,000 mile tires treated with 303 and they look but have the feel, grip and tread of freshly fitted tires but look a lot better due to the 303 conditioning. These are not typical "rubber or plastic gloss" type automotive…