I suppose there's no reason why you couldn't caulk the ring of the can to the ceiling. But that's going to be no replacement to properly sealing from the top. Get a foam gun and just dump it all over the can and all wound it. Don't worry if it looks like a head of cauliflower afterwards. That means you did it right.
All can lights a leaky. AT cans are a little better because they don't have slits and openings all over the place. They're still pretty bad. All you can do really is cover it with a monolithic cap of foam that extends to the ceiling an inch or more around it.
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You know you're an ecorenovator if anything worth insulating is worth superinsulating.
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S-F: "What happens when you slam the door on a really tight house? Do the basement windows blow out?"
Green Building Guru: "You can't slam the door on a really tight house. You have to work to pull it shut."
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