Frost King Available B2 Mortite Caulking Cord 19-Ounce 90-Foot Long, Grey, Gray

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.

This caulking cord has been brilliant at stopping droughts from my windows, so easy to work with because it’s so pliable and easy to stuff into crevices. Doesn’t look messy at all if you do a neat job with it. Adheres to paintwork really well when well pressed in and stays put. An excellent purchase *****

Good and easy to apply and stays soft great

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!

As I said the roll was smaller than it appeared. I can use it however as a gap filler in laminate flooring.

Does the trick

excellent product. does exactly as it says. never hardens.

Works!

This is the standard in clay window caulking. It comes in a roll and has several strips that you can choose the size you need from. It is better to apply when it isn’t freezing cold out, but you can when cold too. Just have to push harder. I have plants on my windowsill and this helps a lot when I caulk the windows. Also, easy to remove in the Spring, and no worries about apt management fuss on this either.

I use this to winterzie my patio door for winter and the misnus thirty weather to keep the heat in. Works wonders and is magical. I now can save money on heat and actually stay warm in my place.

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

The product description does no say how wide this roll is. There used to be wide and narrow versions of the product. I am taking a chance a buying it anyway because the picture shows the right number of calk strands. The wooden covers of my crawlspace vents do not fit air tight, and the furnace air ducts are in the crawl, uninsulated. Between the crumbly cinderblock foundation, and the square of plywood used to cover the vents, there is an irregular gap that must be filled airtight before each winter. Tape won't stick, regular calk can't fill the big holes and regular calk will not stick to dirty or crumbling surfaces. If you use any other calk and it falls off in mid winter, you cannot re calk if the temp goes below zero. Mortite is awesome. You can use the whole width, or separate the strands to make a narrower strip. It is like pliable clay, clean and easy to work with. It used to be reasonably biodegradable, made of chalks. It doesn't bond permanently, but sticks great against brick, cinder, rotted wood the problem surfaces. Here is how I seal my vents. Remove plywood vent cover. Cut a square of closed cell foam to fit the opening. and place it into the opening on top of the screening. (I cut up the foarm mat sold to use under sleeping bags). Cut four lengths of the widest mortite (about an inch wide) and lay the strips about the opening so the center line of each strip is on the edge of the vent openting all around. The opening will be 'framed'. Press the putty lightly against the foundation, just enough to hold it it place. Carefully press the plywood vent cover back into the vent opening. The vent cover will press into the mortite lining the opening and make a great seal. Then, and this is the most important part, break off four more strips of mortite to cover the four sides of the rectangle opening. Lay each strip so half the strip overlaps the house foundation, and half overlaps the vent cover. Now you have a mortite sandwich with the edges of the vent cover. Press the Mortite tightly against the foundation of the house to make it sticke real good. Lasts all winter airtight, and my vent covers are rotted and wet. In spring, the putty comes right off

Great keeps I still have a few left. Very useful I used on window and garage where light skip through the tiny hole. Need to be sealed put in ziplock not to dry out.