i was thinking of using great stuff

[Pericles]

Great Stuff is an aerosol can, single part foam, that skins over and is only suitable for sealing gaps in houses. In breaks down in sunlight. Marshmat posted that information 3 days ago. Great Stuff certainly will not be joining the small expensive club of closed cell, 2 part polyurethane foams that are impervious to water.

http://greatstuff.dow.com/greatstuff...here/index.htm

Pericles

[tuantom]

I hope the 2-part polyurethane foams have improved over the years since I just filled about 16 cubic feet of voids in the hull of my boat with it. I personally know 2 people, plus myself (and I don't know that many boaters), who removed very heavy, water-logged foam from their late 70's early 80's era boats. Those two never replaced the foam and their boats have never been better (at least lighter and faster) - I was hesitant to pour it back into my hull; I'm still not sure if it was the best idea- but it's done and time will tell. I was very careful to wait for optimal temp and humidity to pour it, though it creates a good bit of its own heat while it's setting up - so controlling temp is hard.
What do they use for foam in buoys and floating piers? especially fuel piers. I think these would be good indicators of how closed cell it remains over time.

[PAR]

Tuantom, the foams that were used in that era (1970's and early 80's) were not polyurethane and you're quite correct, they sucked like a hooker outside a GM assembly plant on payday (sorry, couldn't resist).

There are several manufactures of honest to goodness, marine grade, 2 part polyurethane foams, intended for floatation and extremely resistant to moisture, chemicals, fuels, etc.

Pericles, I get my foam from FiberGalss Coatings, Inc. (www.fgci.com) They have the specs available and also sell a 4 pound foam as well as the 2 and 8. You may also want to try Epoxy Products brand of foam too.

I'm in complete agreement on foaming in tanks (frankly a lot of other things too). It's a guarantee for future repairs at least, possibly causing much more then just a leak.

Maybe Rhino Coating the tanks (completely abated first), then foam . . .

[tuantom]

Or use Pre-Kote on the tank and epoxy. They use it on airplanes in place of aladine.

[Pericles]

PAR,

Epoxy Products, these guys? http://www.epoxyproducts.co.uk/

Pericles

[PAR]

Sorry Pericles, I misquoted the company name.

http://www.epoxysystems.com/products.htm

Scroll down to product # 425.