I have used three different types of spray foam. The first is the polyethelene GreatStuff. It has to be sprayed upside down, which is a problem if you are trying to seal something above your head. It dries to be rigid.
The second was also GreatStuff brand, but it was a urethane based foam. It stays flexible when it dries, so it is good to use around windows and doors. It can be sprayed in an upright position, at least when the can is mostly full.
The final type was also flexible when dried and seemed to provide fewer closed cells. Like the urethane foam, it remained flexible. I can't remember what it is called and haven't seen it in the stores since I bought it the first time three years ago. The main thing that I liked about it was that it is easy to clean up.
|