How about using Great Stuff from Dow, spray it in in small
layers/quantities
to allow for a complete cure before adding more?

Anyone have suggestions? What's easier? What's more worth it? Any
pourable
Mfgr's suggestions?
I'm a newby to boat construction but NOT to woodworking.

Thanks in advance
Don


Having just faced something similar (an irregular shape I wanted to have
foam in) I can share some info from Dow:

Great Stuff isn't. It's hygroscopic and open celled; in English that means
it will soon have no floatation in the event of a leak or any air
infiltration which can condense moisture.

I'm using the appropriate product, Froth-Pak, from Dow to fill my very
irregular space. The rest of it I'm epoxying from extruded polystyrene
sheets (just to make it more bulletproof and edge-sealed; it's closed cell
and relatively waterproof as a genre). I'm using it for insulation, but
keeping water out is of major importance to the project.

Froth-Pak comes in 1 cubic foot or much larger sized 2-part containers.
Spray it in similarly to Great stuff, but do some external testing first to
get a feel for how much it expands.

Visit rparts.com's user's forum and look for my threads there; Glenn Ashmore
has also used a two-part poured foam successfully, and I know he's equally
anal about keeping water out.

L8R

Skip


--
Morgan 461 #2
SV Flying Pig
http://tinyurl.com/384p2

"Twenty years from now you will be more disappointed by the things you
didn't do than by the ones you did do. So throw off the bowlines. Sail
away from the safe harbor. Catch the trade winds in your sails. Explore.
Dream. Discover." - Mark Twain