I've tried other brands/styles. Nobody makes this as good as 3M does.

found best to put in frig to firm it up if not very hard to tear apart if not in frig, works very good

Used this to fill the gaps in the firewall around the heater core inlet and outlet for a tight seal. Works great and paint adheres to it too

I LOVE THIS STUFF! I'm prepping my 1995 Honda Del Sol for a custom paint job, so naturally I want to be sure that everything else is near perfect with the car. If you know anything about Del Sol's you're aware that they have a problem with leaks in both the targa top and the trunk. I pulled the covers on the 'sails' off the car behind the targa top and found (as is the norm) that an accumulation of silt had clogged the drain holes and the seals around the clip attachment points had dried up, creating leaks into the trunk. I used Strip Calk around each of the attachment points and sealed everything then cleared the drain. Problem solved.I also removed the targa top and inserted a piece of rope into the weatherstrip channel (to get the weatherstrip to press against the roof panel better) then sealed the rope in place with Strip Calk. No more leaks in the interior.I also made the mistake of breaking a tab off a piece of plastic trim that that fits into another piece of trim. The tab is impossible to fix AND impossible to buy (given the age of the car). No problem. I added a small piece of Strip-Calk around the edge of the trim, pressed it in place and removed the excess so you can't see the repair. Perfect! If I need to remove the piece again, it's easy to do so, but it won't fall apart, and I can always repeat the Strip Calk solution.Strip calk remains sticky forever, so you have to be careful where you use it, but for sealing leaks and fixing cracks in 23 year old weatherstripping that is impossible to find, it's perfect! (As long as you can use it on a hidden surface of the weatherstripping. This stuff sticks to everything, so you can't use it in place of weatherstripping, where it might touch a door for example, But you CAN use it to reattach weatherstripping to its metal attachment points or to close some cracks in weatherstripping.)I'm finding lots of situations where Strip Calk solves a problem that I had no other way to solve. Example: The Del Sol door panel has a deeply recessed screw in it so your screw can easily drop off the screwdriver and into the bottom of the door. If you're removing the door panel this isn't much of a problem, but if you just spent a half hour lining up plastic pins and getting them in place, and you drop a screw into the bottom of the door during the last step in reassembly, that is a huge nuisance... However, a tiny dot of Strip Calk between the end of your Phillips head screwdriver and the screw head ensures that that friggin' screw isn't going anywhere but in the door panel hole. :) It works more reliably than a magnetized screwdriver.A lot of folks seem to complain that the strips either stick together or stick to the paper, but in reality this is a minor issue. Sure you might get two strips when you wanted one, or pulling the strip off might result in breaking a strip in multiple pieces. But just remember, this is a piece of caulk... you can form in into any shape you want... be creative.Also, I've found that if you wet your fingers before handling it, it won't stick to your fingers and you can manipulate it in any way you want. When the water dries, the caulk gets sticky again, so, no worries. I always keep a spray bottle full of tap water near my box of Strip-Calk,If you work on older cars, save yourself a lot of heartache... get this stuff.

I own 4 collector cars in various stages of restoration and have purchased a total of 3 boxes now from Amazon over the past year and they work great (!!), so I am satisfied with them and decided to take a moment and write this review as I remember seeing complaints about them here that they were "all stuck together" and "unusable" and I guess if you get an old box that's been sitting in someone's hot warehouse, that might could happen but I haven't had any problem now with my 3 separate purchases spread out over the year AND I STORE THEM INSIDE MY HOME in the A/C where heat and humidity will not get to them so I can ensure myself that when I need them, I won't have any problem with them being a gooey mess all stuck to each other. I think people need to keep in mind that that is the nature and DESIGN of this product - to stick WELL to whatever you need to stick them to and that the individual strips will stick to each other better THAN ANYTHING, and if there is a flaw with them, it might just be how 3M have chosen to box them and you will get a few here and there that are touching a little close and that you'll have to work a bit to separate, but overall, they are super-handy to use this way. I have used them for a multitude of projects, the biggest was sealing up leaks into the interior passenger-side floorboards of my 79 Hurst Olds Cutlass' AC / Heater box to the cowl after having to remove the upper panel months ago to make repairs, having to break the factory seal. Great to be able to wash the car again with NO MORE LEAKS and this material I expect will last another 30 plus years, sealing even better as it settles over the next several months through each heating and cooling cycle as I use this car. Have also used to refit new door panel watershields onto doors on a few of my cars and they work great for quieting down rattles from the underside trunk support framing (strategically pushed into place, mostly out of sight, using a putty knife) and other places from heavy bass from car stereos. I will continue to buy them from Amazon as well and honestly, hard a hard time finding them anywhere else anyways so I hope Amazon continues to offer them. Hope the time I took to write this review is found helpful by those who've only seen the bad reviews. Cheers!