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

Update: I have been using this same item for years now! You can’t beat what this can do for the price. It remains the same texture over 12 months as I’ve had lengths left over unused in the roll and used it the following winter without issue. It cheeks its same texture. It’s a tough clay that’s easy to handle and stick wherever needed. I love it! I live in an apt that has 10 windows, I really didn't want anything that would block the natural light I get in the daytime. One roll of this was enough for all my windows and I had a bit leftover! Granted, all I needed to seal was where the top and bottom windows meet in the middle, but it instantly made a huge difference! I'll be using this from now on. It was also recently warm one day and I needed to open one window and this stuff lifted off easily and clean, it's so easy to use. Highly recommended!

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

I would like to add a few tips/tricks that I learned while working with this product. First, you will get better results if you peel at least two lines together. If you try to peel one off by itself it will not be as strong and it tends to fall apart. Secondly, it was cold out of the package so I tried warming it up with my heater to see if it was more workable while warm. I do NOT recommend warming this product as it made it more unstable and harder to maneuver. Though it seems hard to deal with while cold, it is definitely the easier way. Make sure that your surface is wiped down well. I had a few areas where I couldn’t get dust off and it was obvious the putty stuck to that and not the actual surface which in turn made it fall off.. There were a few times it would peel off even with a clean surface and I am still working on tricks to figure that out. If I can come up with a solid solution I will update this review and share it with everyone. Overall, I noticed a difference covering only three windows. Though it says 90ft, it doesn’t go as far when having to use thicker sections. This product however, is more than affordable! I plan to buy more and cover the rest of my drafty windows! They are single pane and always letting in cold air. I am so impressed with the difference I immediately saw that I plan on using this product for unseen amount of years!

I am so sensitive to drafts that I can feel cold air in a room with my nose as soon as I enter it. This stuff works amazingly well! Here is what I wish someone would have told me when I was looking to buy this. You do not need vision to apply this. I am totally blind, and I am able to do this without any site at all. It feels like silly putty. All you need to do is press the stuff in the gaps, and the noise and the cold draught go away. This is easier than using plastic on the windows because it does not require the use of tape, a hairdryer, a chair to stand on when you have to reach the high places, or anything else. It requires the ability to use fingertips to press it where you need it, and that's it. If I notice a draught in my house, I am uncomfortable and cannot get anything done. I am extremely sensitive and aware of this. After someone pressure washed my house, I think it might have dislodged a little bit of this at the bottom of my door. There was literally a quarter of an inch that may have come loose. I was distracted by the draft for days until I figured it out. All I had to do was use my finger to push it back in to the area and that was it. It is easy to remove. So if you are renting a house, this is perfect. Just grab hold of it and begin dislodging it from wherever you have it and it will release itself. This is my first review ever, but I actually thought it was important enough because I just used the stuff after owning it for four years, and I still love it today. The coldest it gets is 28 degrees in the winter. But it is 70 degrees outside now, and I still can feel a draught when it comes through the door at the bottom. So it does not matter what temperature it is outside, it matters that I can seal the draught from coming in. I will shiver outside if it is 70 degrees with the slightest bit of wind. This is what I would have wanted to read when I was doing my homework. I hope this helps you too.

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.

This is very easy to work with.Doesn't break apart very easy.Pretty much stays put and is waterproof

This product must be a joke - it is not even slightly sticky, so does not adhere to anything, and is totally useless!

Acheté pour combler une fente entre le mur et la menuiserie. Les cordons se cassent et n'adhèrent pas. Le colis était aussi écrasé. soit le produit est trop vieux soit il n'est pas efficace. Je ne recommande absolument pas.

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 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 *****

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

Easy to use and reapply. Helped seal the gap between the backyard window frame and the floor perfectly, could feel the difference after applying the cord, no more cold air coming in the house through that gap.