Compriband 15/6 Anthracite 1 Roll 5.6 m Length 15 mm Width 6–23 mm Joint Width Self-Adhesive Expanding Sealing Tape Swelling Tape for Gaps & Joints Weatherproof Seal

This stuff is a game-changer! I used it to seal some drafty windows, and it worked perfectly. It’s easy to apply, expands just right, and provides a snug, weatherproof seal. The roll length is generous, so there’s plenty to work with. Highly recommend if you’re looking to tackle those small DIY sealing jobs!

Works well. I found the tape took a little longer to expand to its stated width than other brands I've tried but I'd class that as an advantage as it allows you to take your time applying it. I did find it difficult to remove the backing tape sometimes but carefully inserting a knife blade between the foam and tape helped.

Used this to fill a gap between two outside brick walls which varied between about 10mm and 20mm. It stuck well to one wall and when I checked back about an hour later the variable gap was completely filled. Highly recommended.