Need a little guidance from any of you who have worked with pour foam. Problem- I am having a little trouble figuring out how much pour foam to use to fill 8qts of volume. Current situation- I have made a fiberglass mold of a clay form, and now I want to duplicate it with pour foam. I'm using 5lb pour foam...the form is 8qt in volume, measured accurately. Anyone know where I can get an equation or formula for how many floz of 5lb pour foam to fill 8qt vol and still be at 5lb density? I'm trying to eliminate waste and be more cost effective than doing the ol' "start at one amount, pour it, and demold...then add a little more, and go from there"...that is a total waste of very expensive material and time. Been there and done that. Thanks in advance.