Have you ever driven over a nail, checked your tire, and heard the tell-tale 'hiss' of a leak? Before you reach for the jack, you may want to grab some "Slime" instead. This fluorescent green goo ...

Most are a foam or liquid which is designed to solidify as the air rushes out of the hole in the tyre, creating a blockage that plugs the puncture. Others are kits which use a rubber bung and glue.