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Author	Topic:   Foam for Repairing Unibond Hull
tribologist	posted 10-02-2014 12:13 AM ET (US)         I been working with "two-pound" foam trying to rebuild structures on my 1962 13-footer. I am not happy with the texture of the foam; the cells are too large. Is there a foam that produces smaller cells like the white foam in the original structure? Or, is [reducing the size of the cells in the cured foam] a matter of reducing the temperature of the foam before pouring? Any other tricks? Whipping to break up bubbles? Ulf
elvis	posted 10-02-2014 04:32 AM ET (US)             See this thread: http://continuouswave.com/ubb/Forum3/HTML/020930.html
jimh	posted 10-02-2014 08:13 AM ET (US)             When Boston Whaler uses foam, they contain the expansion of the foam by their molds, and the foam has to expand against a rising pressure in the closed mold. That is why the original foam in a Unibond hull has high density. I don't know that you can produce foam of the same density if the the foam mixture is allowed to expand against only atmospheric pressure.
tribologist	posted 10-28-2014 11:56 PM ET (US)             Thanks, I been working with a 6 lb foam from Merton's Fiberglass lately and I really like it. It is much finer in the texture, still sands very quick with a dewalt random orbit sander and has about the right strength. ULf

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