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Old 04-01-2012
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Spray Foam?

Can products like "great stuff" be used as a replacement for foam that had to be cut out of a small sailboat. It will be (epoxy) glassed over and is replacing what seems to be the support structure running from bow to stern (most of the way). The foam that came out was beyond repair (water saturated) and didnt really seem all that stiff, more of just a shape holding support. Thanks.
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Old 04-01-2012
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Re: Spray Foam?

I have used it, with limiited success. My issue with it is uneven expansion (as it tends to come out of a nozzle, the foam expands in a spherical way - not good for small corners) and limited quantities (if I need to use 2+ cans, with the uneven expansion I get some voids). In the right place - small, regular voids, especially with limited access - it can work.

I moved exclusively to using the 2-part pourable expanding foam, which works really well, filling every crevice. It is also highly adhesive and will provide good structural support in the kind of application you are discussing, and easy to shape and glass. It is also fun to use and fascinating to watch expand! However, you need to be very careful with this stuff too; the expanding foam exerts considerable force, so make sure there is large vent hole. I have seen it tear open fiberglass flotation chambers, bow out hull sides....
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Old 04-02-2012
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Re: Spray Foam?

Works for filling voids on steel boats , but useless for aluminium as water condenses under it , and it gets soggy. No substitute for epoxy on the inside of a steel boat. Quite porous.
Brent Swain, Boat designer, Builder, and author of "Origami Metal Boatbuilding"
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