We had to build a small fire to soften the pitch, but there was plenty of dried grass that would provide a smokeless flame. Doubtless there were surveillance devices dedicated to watching for anything burning, given the damage an out-of-control forest fire or grass fire could do. With that in mind, we’d been careful to set up where the overhead cover was significant. And with the aid of some inspired cursing, we were able to coat the interior and exterior of the crate, with enough pitch left over to seal the lid in place once the matrix was ready.