GorillaSpray Foam Sealant, Light Gray Color, 12 Ounce (Pack of 2) - Multi-Purpose Expanding Foam, Polyurethane Spray, Fills Gaps & Cracks

It does expand and fill crevices. Dries quick, too. Good solid seal.

Great stuff to use. My first attempt was frankly disastrous, but second was much better and evenly. Filled up the space quite nicely.Only issue, and it was my fault, is how sticky it is. I made the mistake of touching it with bare hands. Don't touch it with your hands!

Great product fast delivery

I would have given it 5 stars except the little nozzle clogs and won't clear so you waste product. Other than that it works and expands well.

Depending on where you plan to use it will depend on how good it will be for you to use. If you are using it on a cracked that is on an angle facing down. Then I would not use this particular sealant because it won't stay and falls to the ground.

Used this to fill holes in a window where I had the exhaust from a portable air conditioner going out. It literally stuck to everything and there are traces of it all over my room still but that's a user error and nothing to do it with the product lol also I don't think that air conditioner exhaust is going anywhere for a while and have had no issues with air seeping in or bugs so I am very happy. Also the exhaust is coming out of the basement window which usually fills with water when it rains and never had any issues with rain coming in my windows either so I am happy. The stuff stays hard a s a rock too!! There is a little precise spray attachment on it so it's quite easy to use but again user error nothing to do with the product. Great quality stuff and very happy with it!

Used it once and it clogged. Had to throw it away. Waste of money

Worked as advertised. Final color also matched sandstone rock.