Re: Notes-Questions-Article-All

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Alexander Rice by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ajjrice-at-yahoo-dot-com>

On the can of foam i used recently it recommended that if the cavity was
ddeper then 10 cm then the inside should be made wet first - experiments
support the idea that it is catalysed by water. One comment -  do not get it
on anything it is literally impossible to remove, no solvent even touches
it, not even 111 trichlorethane - dry cleaning fluid!

>
> Daniel,
>
> It may take months to dry. I made a double walled mash tun (think a big
> thermos) for brewing beer. When I filled the air space, I made LOTS of
holes
> and so on, but the foam couldn't dry properly, and left soft spots.
Drilling
> into these holes many days later yielded liquid foam that even when left
> outside would no longer expand when it dried. I later tore it apart
(months
> later) and found that the liquid had dried, but not expanded, leaving a
> swiss cheese effect. It seems there is an effective depth or volume that
one
> can foam at one time. I think if I had layered it over a period of days it
> might have worked.  I used "great stuff" foam.
>
> YMMV,
>
> Jonathan Peakall


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