Sika Sikaflex-221 - White - Multi-Purpose Polyurethane sealant/Adhesive - Creates Permanent Elastic Seal - Sandable/paintable - Non-Corrosive - 10.1 fl oz (Pack of 24)

Sikaflex 221 exceeded my expectations. It’s incredibly versatile, adheres to a wide range of materials, and cures to a strong, flexible seal that holds up under tough conditions. I used it for sealing my little project little tikes and it performed flawlessly—no leaks, no cracks, and it’s weather-resistant. Application was smooth and cleanup was easy. Whether you're working on automotive, construction, or DIY projects, this is a must-have product. Highly recommended!

If you need a really tough adhesive/sealant-this is it. It is a little hard to work with, but is about the best sealant I've ever used. Generally used for RV, boats, but i used it to repair the failing gasket on my refrigerator door, and it sealed it perfectly. Make sure whatever you are applying it to you intend to not take apart-it dries to very strong seal. it can be removed with a sharp utility knife or similar-but this, unlike so many of these products, is crappy water based which i generally find pretty useless for anything but gluing paper together. Even silicon-based caulks do not seal and last like this stuff. And it is equally strong indoors or out. The days of solid construction adhesive are over-except for this.

TRIED SEVERAL ON MY RV TRAILER AND THIS WORKS THE BEST FOR ME. EASY TO WORK WITH AND GOOD SEAL.

Best adhesive/sealer that I’ve ever used. I’ve used many brands of polyurethane sealant, but this one flows better and cures more flexible than other urethane sealers. I’ve used it for ceiling tiles,, shiplap,on walls, backsplashes, sealing exterior window and door frames. Holds up to weather without shrinking.

This product is not water solvable and sticky as heck. Requires a bit of caulking skill but really bonds and is somewhat sandals too.

People complaining about the wrong color or broken package is not a true reflection of the product. Amazon offers free returns, just return the wrong color and reorder.Anyways I used this for repairing a small crack in my roof flashing. Product went on easily and instantly bonded. Found it through recommendations through reddit about roof repair. It was easy to squeeze out of the tube (use a caulk gun with adjustable leverage as I had no issues at all), and was easy to spread and apply. Dried pretty quickly. Unsure about the longevity of the product but initial impressions I am very happy with it.

My new go to for waterproof sealant. UV resistant and flexible this stuff just works. It's super thick so do yourself a favor and get a decent caulking gun, your hands will thank you.

Past purchases have been good, this one the product was very thick, almost dried up but i only used a little to stop a lesk, guess ill throw the rest away