This is the strangest timing. Been following the conversation in the wreck thread, didn't want to hijack that thread with my own story. But now......
I had the same experience as mentioned in the other thread. Few years back, Orkin guy told me to foam some holes. What a mess I made.
But the great timing irony is I just installed a new zillion cfm cook-top exhaust hood, and I'm losing some air back into the house. Bought a can of Great Stuff last week to try it on the leaking sheet metal ductwork. Just the other day the boss asked me why I buy stuff then don't use it.
What she doesn't know is I'm afraid of making a horrid mess. Imagine my surprise when the discussion started in the other thread, with my can of the stuff staring me in the face on the kitchen island.
That's a real mess of a situation you had, TB.