He says it’s for TMNT but this seems easily applicable to Ghostbusters.
Great find bro!
It’s one of his newer ones.
Be sure to check out the rest of his channel, he has a TON of neat projects, some backyard mad science, this one simply felt relevant to here.
This would work well for TVG packs. Does anyone know the shelf life of this?
Only one way to find out 
The only definitive thing I know he said is it dissolves in water, so at least cleanup is easy.