Our old, double French door needs weatherstripping. The gaps are between 2 and maybe 6 mm. Previously, I've used "regular" self-adhesive P-strip, but it didn't stay in place for very long. Now during winter, the strip freezes a bit on the "other side" and gets pulled off when opening the door.
It's an old door without special grooves or similar for weatherstripping.
There must be a better alternative, right? Silicone? Gluing? Stapling? And where to buy?
Grateful for all tips!