Anyone have any opinions on tire sealants like ride on or some of the other ones like tireject? I just bought some new tires and was thinking that might not be a bad idea to have some flat protection especially on a bike. The reviews on ride on are very good but im a little afraid to put a jell in my tire thinking about down the road if it hardens up eventually. The tireject is much thinner but the say its good for a year. What then? does it evaporate and you have to reapply? The website is unclear on some things.