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Posted by David on January 17th, 2003 06:09 PM
In reply to Making my older portable hot tub more efficient by Kevin on January 16th, 2003 10:45 PM [Go to top of thread]

Kevin, adding more foam will help, but if this is a 110v unit I wouldn't expect to see a massive improvement; the 110v setups are just not that efficient.

If you do this with a triple expanding foam (which would be nice since you'll use much less of it than minimal expanding) do it in thin layers at a time, being sure that any place you foam has plenty of free space to escape, and let it cure between applications. This way you won't distort or damage your tub. Too thick of a layer at one time will dry on the surface, and the core will continue to expand and could cause problems.

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