"David" wrote in message
om...
"Morgan" wrote in message
...
George wrote:
"BigWallop" wrote in message

Expandite foam from the DIY Stores. It's commonly used to fill gaps
around windows and doors, but it is also quite a good insulator.
Shake the can really well before using it and keep shaking it
between uses. Be gentle with it, as it blows up to nearly three
times its liquid state when curing.

Cheers. Is it possible to shape it (with a scraper for example) to
the general shape of what's already there or will it look like a
growth on top? :-)

You can cut and shape it with a sharp breadknife.
Or alternatively, if you get the amount just right, cover with a sheet
of
tough polythene, taped down well.
This will give you a similar finish to what is on there now,
but as Big Wallop says, it expands to almost three times the size, so go
easy!

It will look better if you can get it right without having to shape it
(if that matters, being on a HW cylinder!!). But note that there are
different varieties of this foam designed to expand to different
degrees (it's intended as a filler). Brand names like "No more small
gaps" and No more big gaps" if memory serves. You want the one which
expands the least.

I think No More Small Gaps is like decorator's caulk (but in an aerosol, at
an exorbitant price for the amount you get).

No More Big Gaps is the expanding foam. Dunno if you can use what you have
left over in the can later after you've started it - it does say something
about cleaning out the nozzle with a wet matchstick, but times I've used it
I've always arranged things so I finish off the can in one go; filling in
other holes, applying a bit of insulation etc.

For a HW cylinder I'd be inclined to just cover the bald patch with some old
bubblewrap or suchlike.


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John Stumbles
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Women always generalise