017-90892 Sikaflex-221, Aluminum Gray

I believe this is the best sealant on the market. Sikaflex is used by Airstream in their factory for sealing them. I used it to better seal my windows on my airstream. The color matched perfectly and the flexibility really is good for sealing aluminum that is pieced together by rivets. The application was very easy and so was the cleanup. The finished product seems lasting and the sealant dries fasty for quick results. If you have an Airstream or any RV, I would recommend this product. It comes in various colors to meet your needs. Satisfied Customer!

As others have noted, these polyurethane adhesives are just awful to work with… sticky, gooey, and get on everything if you’re not careful. But that’s kinda the point. Tape everything off and go at it (and then after pulling the tape and admiring the clean lines, decide you want to do a few minor touch ups and make a huge embarrassing mess) I might come back and add pics if my off-label use case on a PVC dinghy works… and if I can clean it up a bit today..

I have a vintage Avion camper and bought this to caulk the seals and windows. My camper is anodized aluminum so I had to purchase the right sealant. Was not advised to use silicone caulk so I stumbled upon this Sikaflex sealant. I purchased smaller syringes to fill up and piped the sealant on the seams and around the windows with ease. Still have more sealing to do but very satisfied with this product.

Sikaflex 221 is a miracle product. If you want something glued down and sealed off simultaneously, and you want that thing to never move again, this is the stuff. If there is any chance that you may have to remove that thing some day, think twice! To say this stuff is hard to remove is a huge understatement. It is virtually impossible to cut with a knife, and the bond it forms with whatever you put it on is absolute. You are very likely to destroy things in the process of trying to remove Sikaflex 221. I have used this stuff to mount solar panels to vehicle roofs. Once cured, it's just as solid as if I had used screws. I have no doubt at all about its strength, and it is water tight. Years later, and I am not seeing any cracking or aging of the material. It's amazing.

This is the recommended sealant for Airstreams. It seems to work well. A bit messy. I dries quickly so if you masking-tape the edges don't let it go too long before removing the tape. One of my unopened tubes had hardened before I could use it. Past the return window. Ce la vie.

This stuff is amazing

a great caulk for RV's! easy to work with, and clean up. Drys fast and remains semi rubbery for good seal.

Bought it for my box truck to seal the roof up. All i can say it worked great and there is no water coming in.