Another thing I've noticed in that thread. The purpose of PSK is emergency only, not a backpack substitution. Everyday unwrapping, use, and wrapping back will ruin any makeshift seal quickly.

My tin PSK has recently made its way out from the "secret" blind sewn compartment of my tent's sack bag. It was sitting there untouched for 7 years. The ducttape sealed it so well that I had to cut it around the lid to open the tin. No wonder the content (fire starting and fishing) was in ideal shape.

All in all, my final conclusion would be: the Gorilla tape is not good for waterproof/airtight sealing.