I went through a set of rear tires in two months(bad toe) so I got some new ones. I noticed that they look flat every weekend, so I took it back and got extra sealing glue thing around the edges and what not. Well, it still loosing air everyweek. I've herd that Fixaflat stuff is bad, but is there anything else i can do? I really don't want to fill it up with air every weekend or so. I got chrome, so I herd it will eat it or something. what do you guys think i should do?