[sammyg2]

If the systyem is leaknig cold air into the attic, it's also sucking hot air into the house to replace it. It creates a low pressure zone in the house so any drafts or leaks will be exaggerated. That makes the system even less efficient.

I had the same problem a couple months ago and I solved it with aluminum duct tape. The goop would probably last longer but my hands were still clean.