M-D Building Products 3525 M-D 0 V-Flex Weather-Strip with Adhesive Back, 17 Ft L X 7/8 in W, Polypropylene, White

I've used this for about 3 years now. When you have old double-hung windows, this makes excellent stripping where the windows meet in the middle. I put it on the bottom edge of the bottom rail of the top sash (window), point facing up. I also put it along the top of the top sash, and the bottom of the bottom sash. I would use it in the tracks as well, but I've been rebuilding the windows and putting "spring bronze strips" in the tracks. It's a lot more work, but permanent. I also use this V-Flex in the tracks behind and above the top pulley. I let it run long, behind the spring bronze strip, and it seems to work excellently. Lastly, I also use this on old drawers, where wooden drawer-sides slide along wooden rails in the carcass. I got a quart can of "sanding sealer" de-waxed shellac. I paint the bottom of the drawer sides and top of the rails with it, to give this V-Flex a good place to grip. Then apply it flat--don't make it into a V--on both surfaces. It makes them GLIDE. Some are so worn down that the drawer is "low" relative to the hole in the face of the carcass. In this case, I double the layers of V-Flex right at the point where the drawer is almost closed, with the short piece under the full length piece. This allows the drawer to "ride up" a titch and make a better seal/close. The glue on this stuff is quite intense. My most recent batch that I ordered here on Amazon sticks like crazy. The other stuff that I bought at a hardware store here in town must have been a bit older, as it wasn't quite as sticky. But so far, so good! I recommend it all the time to anyone complaining of drafty windows and doors.

This stuff is great. It not only keeps out the drafts, but really helps knock down the noise that comes thru a doors with gaps. One wouldn't think a little piece of plastic would help with noise, but it makes a real difference. Also, keeps dirt and bugs from coming in thru those gaps. Very easy to install, and I have some installed that has lasted over 10 years. Seal up that old door!

Wasn’t quite sure what to expect this stuff is awesome! Make sure you point the order snide part of the V towards the inside. My windows are about 13 years old now and never been maintained. This helps with the draft coming in. Quite simply/easy to install. One 17’ package got me through 3 1/2 windows. The big box stuff you can get will work if you never want to open your window. This allows window to be opened and closed. Curious to see how it will help in the AZ summers.

I've put this on three doors, and it works really well, but you need to think a bit about what you're doing. First off, if you haven't used any kind of v-strip before - it folds in half, into a V. There's self-stick stuff on one outer side of the V. You look at where a door or window is going to close, and stick it on such that when the door closes it will press against the pointy side, offering little resistance and pushing the V flat. When the door opens the material will spring out, at most into more of an L shape. Therefore the maximum width it can seal is half the width of the tape (and realistically a bit less). So if you see a 7/8 wide tape that seals 3/8 like this one, well, that's why. The nice thing is that there's a fair amount of flex to it, and if you have an uneven gap it will do a pretty good job of filling it, since the door will push down as needed. It's quite thin, so if it starts binding you probably didn't need any weatherstripping anyway. It's much less frustrating than various foam or rubber solutions where you pretty much have to exactly match the width (although those probably provide more insulation if you can get them to work). I have a door that's badly wider at the bottom than the top so this is pretty much the only kind of product that's going to work. The downside is that the first time you use it, you kind of have to puzzle out where to stick it pointing in what direction and the directions aren't that good. But if you just fold it so the stickem is on the outside and walk over to a door and hold it up and orient it so that the stickem sticks to something and the pointy side points towards the door you'll see how it has to go. It's not rocket science, but I can definitely see that if you didn't think about it and just started sticking it around you wouldn't be very happy with the results. If you don't want to be a "one star" person you can always cut off an inch and make sure you know how it all works before sticking the whole roll to the door.

This product worked ok for the first winter, but after the first year the plastic crumbled, so every time you opened the window it was like someone dumped out a bag of tiny crushed potato chips. I've since removed them from 30 windows. Which was a pain because after the plastic crumbled away I was left with the adhesive portion, which didn't peel away cleanly either. I had to use goo gone for many of the windows. Would never purchase again under any circumstance.

This product is very easy to use. When I installed it I had an extra set of hands to make the process easier. I used this product around the jambs on three entry door systems. I only applied it to the latching side and head jamb. You could certainly apply it to the hinge side of the jamb, but it wasn't required in my case. I bought this product with the intent of sealing the minor gaps between jamb and door. The intent was to reduce air infiltration, dust and insects into the home. I applied the tape after cleaning the jamb area with a rag lightly dampened with alcohol. You want the surface clean. Since my doors already have the foam compression weatherstrip on the jamb, I added this just in front of that for added performance. Now I see no daylight between door and jamb. There is no cold or warm air coming into the home so drafts have been eliminated. I am very pleased with the product.

I liked the idea of this v seal. Installation was very easy but the part of the v without the adhesive doesn’t stay straight. Instead it stays wavy. I don’t know who it will impact the performance of the seal since I haven’t had a super windy day to test it.

This requires a little thought to seal old double or single hung windows: I will be using this to seal single hung windows of a 90 year old bungalow. This is where the top and bottom sashes meet. I need something that takes up very little space else the windows may not close all the way. There are two ways this could be installed. If you stick it to the back of the bottom sash, then the folded edge would have to be pointed down so that the down motion of the sash completes the fold and seals it. The problem with this method is that the open V would be facing up and would catch debris. The best way is to stick it to the bottom of the top sash with the folded edge facing up. That way the open V would be facing down and gravity will help keep debris out, the down motion of the bottom sash will complete the fold and seal. Also, this way outside air pressure (wind) from outside will force the seal even tighter. I will put a stainless steel staple at each end on the flap having the glue to help insure that does not peel off. Note: I am putting bronze V seal on the sides and 1/4" tube seal on the bottom of the sash (this requires a slot cutter and a router).