I've started thinking about punctures. What I always used to do was carry an inner tube. Anyway, I came across this green stuff called 'slime'. It seems that if you get a puncture you can just squeeze some in, spin the wheel and pump it up and that's it. I've bought some, but does anyone have any experience of this stuff, and also what do you do about punctures? Should it always be a new inner tube, or are patches reliable enough? And out on the road with whatever the weather could be, or the time of day, or the location? Are some inner tubes worse than other inner tubes? And tyres, are some puncture resistant, I think tyres can be lined inside with a protective 'shield' mat? And any other thoughts about punctures.