Originally Posted By: nursemike
I have devised a solution to this non-problem: pack the square indentation in the cap with baking soda, secured with scotch tape


Good idea, but how about inexpensive plastic wrap that will melt faster than scotch tape. Kind of like the sensing element in a sprinkler. The element melts and when it does a valve opens on the sprinkler and releases water or some other material (not sure this is with all kind of sprinklers). Wouldn't you want the barrier between the sprinkler and matches to melt fast?