On Tue, 14 Jun 2011 19:54:31 -0700 (PDT), Frogwatch
wrote:

The amount of ignorance
exhibited here is astonishing and dangerous. All you have to do is
google propane boat accidents to see.

Fortunately I've never seen a propane explosion but they can be
spectacular and deadly, that's well established. Better to be safe
than sorry in any case, and leaking cannisters are no joke.

Here's a thought: Since half used cannisters are prone to leakage
after removal, why not carry a spare torch tip or two that you could
screw onto a leaking cylinder. They are inexpensive and should be
enough to seal it.