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

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.

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!

I used this to glue a flexible solar panel on the roof of my car,. solar panel does not move.

Needed for rv windshield leak.Worked well.Time will tell for long term effectiveness.

Applies nicely with no sag. I used it for all of my penetrations for various camper component replacements (microwave vent, windows, etc.). I did not use this on the roof though, I used Dicor.

This stuff really works. My wife purchased a vintage camper that was leaking from the marker lights and front window. Let's just say, NOT ANYMORE!! This sealant works GREAT!! Definitely recommend this product for any sealant needs. 👍🏻👍🏻

First thing I absolutely hated about this product is that it is nearly impossible to dispense it from a caulking gun without using both hands to squeeze the trigger. This makes for a messy job no matter how hard you tried not to. DO NOT get this stuff on your skin or clothing. I ruined my shirt but it was a work shirt anyway. Stains your hands black and is nearly impossible to get off even after 4 days of trying. Time will tell if it sealed up the RV window well or not.Do yourself a favor and buy something easier to use. A 10 to 15 minute job ended up taking and hour and a half to finish. Making the hole in the end of the caulk tube didn't help at all. I will not be a repeat buyer of this product.

Great purchase