The Nissan Path

Have any used the Ride-On product;

Can I get turf my spare tire?

http://www.ride-on.com/prod_plt.asp

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Looks like fix-a-flat, only without the air pressure. I actually had to use fix-a-flat before and it worked fine until I got my tires balanced. The tire guy had to scrape it out to get it to balance. Held up fine though, kept the air in the tire.