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Boat Forum / Building / November 2007Spray Foam for Floatation?
I need to fill in some missing foam under the front seat of an aluminum john boat. Does anyone know if I can use that "Great Stuff" spray foam or whatever it's called that they sell at Home Depot, etc. for use in houses? I believe that stuff is a closed-cell foam. Has anyone used it in this application and is it appropriate? Thanks. "- Colonel -" wrote : >I need to fill in some missing foam under the front seat of an aluminum >john boat. Does anyone know if I can use that "Great Stuff" spray foam or >whatever it's called that they sell at Home Depot, etc. for use in house I >believe that stuff is a closed-cell foam. Has anyone used it in this >application and is it appropriate? Not a good application for Great Stuff. You need to get a poured urethane foam kit. Do a Google. I bought a kit from a company in South Florida a couple of years ago. Lew > "- Colonel -" wrote : >> I need to fill in some missing foam under the front seat of an aluminum [quoted text clipped - 12 lines] > > Lew OK, Thanks, Lew and Brian. On Thu, 22 Nov 2007 17:04:33 GMT, Colonel <nobody@fishing.net> wrote: >I need to fill in some missing foam under the front seat of an aluminum >john boat. Does anyone know if I can use that "Great Stuff" spray foam [quoted text clipped - 5 lines] > >Thanks. The only relevant factoid I have is that people who used foam polurethane aerosils under a glass skin on homebuild aircraft were disconcerted to find that the stuff swelled again on a hot day, messing with their faired curves. Brian Whatcott Altus OK On Nov 22, 12:04 pm, - Colonel - <nob...@fishing.net> wrote: > I need to fill in some missing foam under the front seat of an aluminum > john boat. Does anyone know if I can use that "Great Stuff" spray foam [quoted text clipped - 5 lines] > > Thanks. I used it in a couple of cheap canoes. It works ok, and if shot in right, is pretty waterproof. Only downside is it is a real mess and gets yellow and brittle after a few months. You can however shape it easily, and paint over it too. So if it is just a knock around boat, and a small space (I would not do a whole boat with it) I say go ahead and use it. Here is a tip too. You can take some chunks of old foam, even open cell, and use it for filler as long as the chunks are surrounded by the great stuff. If you have a bigger area, do the sides and bottom with the GS, lay the chunks in the cavity, and cover with more GS... I think you get it. Also, do not fill a whole area at one time, use the stuff in layers and leave a few minutes between apps for each to puff up... Don't mess with Great Stuff in your boat. Great Stuff requires moisture from the air to expand and cure. If filling a large cavity the Stuff in the middle won't get enough exposure to the air to cure, and will remain uncured, and there is a potential that under the right conditions, it can later get enough moisture to expand at the worst possible time. There's no reason to use it, except that it is available at the local Wal-Mart. It won't be cheaper than 2 part foam. It will take longer to apply. Go to http://www.raka.com or http://www.uscomposites.com and buy some of the 2lb/ ft3 two part foam instead, they'll have it out to you in a couple of days and you can do your boat right. Ed. |
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