I would not waste my money on it. It is very expensive. I built my upper
cowling plug with it and was a major waste of money. The stuff expands
forever. Later after you start cutting in it, will start changing shape
again. Few times after I had the final shape perfect I went home. The next
day I had depressions in some places the size of my fist. Even after
glassing the surface it continued to distort.

        I'm pretty certain that not all foams are equal. I used the pour foam and never experienced any of the problems you mention. Within 10 minutes it would reach it's final size and shape and would not move or distort in any way at all. It was easy to sand to shape which would remain exactly as I left it, with or without fiberglass over it.

        I actually enjoyed working with the stuff. Maybe I just inhaled too many fiberglass fumes :-). I don't remember the brand name of the stuff I used (I'm at work now so can't check), but it was only $40CAD for 2 liters (1 liter of each part) which expands into a ~gazzilion cubic feet. Since so many others use it successfully, I guessing you may have had either a bad batch or the wrong stuff.

And BTW, the pour foam, when it sticks to something, forget it. It will stay
there forever.

I agree with this. If you can't reach it with a scraper, it stays.

S. Todd Bartrim         (off to Mexico for a week)
Turbo 13B
RX-9endurance
C-FSTB
http://www3.telus.net/haywire/RV-9/C-FSTB.htm

        "Imagination is more important than knowledge"
                                        -Albert Einstein