B2 Mortite Fingertip Caulking Cord, 1/8" x 90 ft, Grey

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.

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

This is a good way to seal up SMALL gaps and keep the cold/hot air out or from escaping. This size is good for gaps of approx 1/8” It allows you to press some into the gap and have a bit to press down on either side of gap for a good hold. This also allows for easier removal when time comes. One important tip is to let the roll warm up before you try to peel the cord. When it is warm it is easy to handle and unroll the cord. If it is cool or cold it is harder to handle and spills apart easily. Not a deal breaker, i just find it much easier to handle while it is warm.

This product was precisely what I needed to stop the air leak at my front door. I’m astounded by how effortless it was to install and how effectively it works! As a renter, I was hesitant to invest a significant amount of money in a repair. I’m thoroughly satisfied with my purchase and highly recommend it!

Stuck and stayed when it was above freezing, so good adhesion then. But didn't seal well once we went down to zero temp. Good quality when it worked. Still flexible when below freezing, but stickiness was lost once hit below that. No smell. Good color match to white.

Surprisingly great, and a lifesaver for our drafty bedroom. Here's a tip: the more you use it, the more of the stickiness will be transferred to your fingers. After a time, you may find that the material would much rather stick to you than to the surface. Coating one side (but only one) with some lip balm I had on hand instantly remedied this: my fingertips slid right over the surface and the material stuck effortlessly to the window frame.

I bought a similar item in the past that worked great. This one breaks apart in short strips instead of long ones. You’re supposed to be able to take a part of it and strip it off as long as it’ll go and put it in the window. Instead, it falls apart and you end up putting little bits in at a time which is not as effective. It’s in my window now, and the cold air still goes through parts of it. I won’t buy it again.

Frost king--- new branding/packaging? Same parent company so possibly just different, either way- item works. Product is good, it helps block some draft in older windows. Easy to use. No mess.

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.

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 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