It was somewhere outside Barstow when Unisaw A-100
Years ago I shared a flat with a guy who developed the squeezable
ketchup bottle. Now this was a clever bit of plastics work -
something like 7 layers involved in it. The problem is that
polyethylene alone is permeable to water vapour, which isn't a good
thing for ketchup. I was working for the phone company at the time,
where polyethylene cables are lined with aluminium foil.
So when I threw away 2/3rd of a bottle of Balcotan PU glue, I took
steps to avoid its successor going the same way. I wrapped the
squeeable and probably permeable bottle with aluminium foil. So far
this bottle has lasted twice as long as the first and hasn't set in
the bottle. Inside the nozzle cap though, where I haven't installed a
moisture barrier, it does go hard if I don't use it for a while.