Sikaflex-221 Multi-Purpose Polyurethane SealantAdhesive, 10.1 fl oz, Black Permanent Elastic Seal, Sandable Paintable, Non-Corrosive, Bonds to Metal, Plastics More.

Great brand always works

used this for a repair that needed waterproof and permanent - this applied on easy and so far 100% resolved issue! I used AI to recommend product off amazon after uploading to AI a photo of the damage and this is what it recommended.

Me ayudó con la filtración de agua en estas lluvias

Trabaja bien. Sella correctamente. Solamente noté que fue sencillo de quitarlo después de varios meses en unas piezas revestidas de pintura esmalte

I used Sikaflex to adhere a roof wing to the back windshield of my car, and I’m seriously impressed with how well it worked. The bond is incredibly strong and feels permanent once cured. I let it set for about 24 hours before driving, and even after months of highway speeds and temperature changes, the wing hasn’t budged at all. The application was pretty straightforward, it has a thick, tacky consistency that gives you enough working time to position everything correctly before it starts to set. I’d recommend taping or clamping the part in place while it cures, because it does take a while to fully harden. Once cured, it’s flexible enough to handle vibration and movement, which is great for automotive use. One thing to note: this stuff is messy. It’s sticky, and once it gets on your hands or paint, it’s not easy to remove. Wear gloves, mask off surrounding areas, and have some cleaner or mineral spirits ready. Overall, Sikaflex delivered exactly what I needed, a strong, weatherproof, and vibration resistant bond that’s holding my roof wing securely in place. It’s not the cheapest adhesive, but it’s worth it for the strength and reliability.