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I'm pretty certain that not all foams are equal.
I agree 100%. I've been using this stuff for years and the only time I've experienced problems with it was when I didn't mix it properly. When the 2 parts are put together you need to stir vigorously (and I mean VIGOROUSLY) for the recommended period... the product I use most frequently requires 30 seconds. After my first few batches I knew that I could keep mixing for 40 and still get it out of the container so that's what I did... depending on the hardener you choose the expansion will be from 10 to 30 times the volume... high density hardener (ie 6#/cf) expands less (smaller bubbles) than low density hardener (3#/cf). I've found that the 4#/cf product is perfect for most applications, you get about 20x volume expansion, it sands well and is easy to work with. My only complaint is that the bubbles are a bit large so if you're using it for the basis for a layup it holds a bit more micro-slurry than does the 6#. I compensate by making the slurry a little dryer, kind of like thinned peanut butter, prior to skinning with glass or carbon fiber. BTW, this is basically the same thing as Great Stuff, except that GS is a very low density foam, probably 1.5#/cf and, as such, remains too springy for structural applications. I use a company called Fiberglass Coatings, Inc. in St. Petersburg, FL for a source... their price is right. I'm pretty sure they have an 800 number. Get a catalog.
<Marv>
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