Frost King Beschikbaar B2 Mortite Caulking Cord 21oz 90-Foot Long, Grijs, Grijs

This product is fantastic. It is so versatile and holds up forever. If you don't use it all, wrap in plastic to keep out air and it will still be great a year later. The cords make it easy to remove the exact length and width you need for whatever you are insulating.

This is like Plasticine, and can fill really really big gaps as well as little ones. Very easy to use; doesn't need any tools, or even any precision as you can simply squish it into corners and awkward cracks. And you can take it off if you need to. No idea why I couldn't find a UK stockist - it's a very useful product - but the delivery from the US was just fine, and it actually arrived a week earlier than I expected. Recommended.

Feels like plasticine. Haha. Good stuff.I bought it by mistake, thinking it will harden in place.

This stuff is awesome.. it says you can use it as a 'general plugger-upper'.. & man I have!! So far this has successfully sealed.. exterior window drafts/edges, interior window drafts/edges, shuttering drafts/edges, a small leak on a radiator edge, a wee crack on a dehumidifier and even an interior car vent. Ordered another roll to have stashed in the tool cupboard - Highly Recommend! It's like a modelling clay version of duct-tape.. can do everything! haha!

Good amount of footage. Product quality seemed of good freshness. I use it around window seems every winter heating season.