Steel basement door. Original vinyl weatherstripping fit in a slotted metal track deteriorated after 40 years and no longer works. As you can see daylight shines through which I'm guess means cold & hot air do too.
I tried this stuff but it was so thick the door would not close & latch properly:
What I ended up with was rubber foam tape that is not very good. This is actually the 2nd time I've applied it as the adhesive wears out over time and the foam just dries out and flakes away (white strip next to dark strip):
The track the original seal was set in is pretty much non-removable. The screws holding it in strip when I try to take it out.