I want to squirt some expanding polyurethane foam into a section of
mdf box cladding covering some copper water pipes to cut down on
draughts (an insects) from getting into the kitchen. Since I want to
be able to remove the cladding if necesssary, what can I use as a
release agent to prevent the foam from sticking to the inside of the
cladding? The stuff seems to stick quite firmly to prety much
I'll remove the section of cladding before applying the foam, but then
replace it before the foam has set, to get a reasonable seal between
I think I would go for slightly thicker polythene sheet (in one piece).
Were you planning to let it mould over the pipes too? Does it matter if
it sticks to the MDF, so long as the MDF and foam come off as one piece?
Thicker polythene (than clingfilm) and a quick blast of pledge before
putting the foam in would be my choice if I really didn't want it to
stick to stuff that was already there. Be aware that the expanding stuff
is very keen on expanding and if it can't get out from a space througha
hole will deform whatever it is inside making it bulge .
It needs to go around the back of the pipes, so don't want it to stick
to the cladding. Cooking foil might be an alternative (comments about
cling film dissolving noted).
It says on the can that it's ok to use on electric cables, but is it
really (if it will dissolve some plastics)? Might have to put
something over the cables.
It won't stick to polyethylene film, as such. Wrinkles and folds will hold the
film on the foam. Just leave the film in place. Beware: one hole, and you will
bond everything together.
If someone would remind me how to upload photos to the Wiki, I could do that...
Once logged in, click on the "Upload File" link on the left.
To display your photo on a page just include:
(there are some other bits you can tack on the end if you want to
specify display sizes, captions etc)
On 24/10/2017 16:38, email@example.com wrote:
My recent experience with a one part x50 expanding foam from a gun was
that the resulting foam wasn't particularly dense or strong and I guess
that further expansion would have been contained if the former was
reasonably stiff and was securely fastened down.
I will admit that I could see where all the foam was going and I did
have a few test squirts to see how much it would expand.
Don't the one part expanding foams come in different expansion versions?
On Tuesday, 24 October 2017 10:11:42 UTC+1, Davidm wrote:
The foam needs moisture to expand and set.
So it won't work.
You can spray some water into the void before the foam but the results aren't very neat.
Boats/cavity walls etc use two component stuff you have to mix.
In practice it's mixed in the spray gun at the nozzle.
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