Thanks for the responses everyone!
I really like the idea of slobbering foam all over the top of the unit like S-F says, as it can't help but to seal everything up. The response from Juno is par for the legal department, real world is another matter though I'm sure. If CFLs were exclusively used the thermal risk is probably pretty low. However a 120 watt incandescent could probably be mistakenly screwed in and when operated for 24 hours on a 110 degree day without air conditioning there could be some problems, at least some bad smells. We're dedicated to using only CFLs so it shouldn't be a problem for us.
The other really good thing about foaming the whole can is stopping any vapor transfer. That is something I hadn't considered.
I guess I'll look for a good place to buy some Pur or One Touch. Any suggestions for great deals?
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