2# is correct for your application. The stuff from US Composites is closed cell. As cdavisdb said - that's important.
To the best of my knowledge, older variants of "closed cell" a/b mixed foam were prone to water absorption. I have heard stories of BW boats that had problems with gaining water-weight a few decades ago, maybe even more recently. The newer closed cell foam is not prone to this.
Do a small test batch so that you can anticipate how fast and how much it expands - it outgrows the mixing container pretty fast. When you install it, mix it close to your work and work in small batches until you fill your space. Cover anything nearby that you don't want foam on - its messy. Be careful where you set your used mixing containers down!
Good luck
|