Good idea! Will it light up with a spark after it gets wet?

That is one problem with regular waxed paper, say from one's sandwich. Great tinder, but if soaked it does not reliably light from a spark.

I know it will not seal a bottle of chloroform, eats through the parafilm. I wonder if it will seal deet and other rather active substances? I doubt many would use if for that, but it might have an indirect impact, say if one's PSK was sealed with it and a container of deet leaked in one's kit, onto the parafilm sealed PSK.