Product: Fix a Flat
 

http://www.kk.org/cooltools/archives/000721.php

Does this work?

I have a sub mounted in my trunk and it is heavy. Therefore it is near impossible for me to lift it up to get to the spare unless I ate my protein early in the morning.

I have used similar products on few occasions, never on the X though. It depends how bad is the puncture of course but in most cases it should enable you to resume your trip to reach a garage where you can get your tire replaced. In any case this would only be a temporary fix.

I agree. It saved me a few times. I always keep one in the cargo area. If you're dead flat, without access to air forget it but in most cases it will get you off the road to safety.

note that you cannot patch a tire well after using the fix a flat stuff. I would not recommend using it since it gets everywhere.. all over the paint and is a pain to remove.