I’m in the process of insulating a room internally and so
thinking of getting a gun for expanding foam. Is it possible to
take the can off while there’s foam in the can? ie do the cans
have valves, and can you expect to be able to use the foam again
after a while? Obviously the gun would need cleaning. Part of
the reason for the question is that I might want to have two
cans of foam on the go (normal and low expansion).
I had a look in the wiki but didn’t see an answer.
Jón Fairbairn email@example.com
http://www.chaos.org.uk/~jf/Stuff-I-dont-want.html (updated 2012-10-07)
On Monday 25 March 2013 10:54 Jon Fairbairn wrote in uk.d-i-y:
Yes and yes - although older guns sometimes IME get a bit of dried foam in
the ball valve where it attached to the can - this allows slow escape of
foam and required blowing the gun through with cleaner if leaving off (or
the foam is liable to harden in the gun).
The cans are OK left off if you squirt a bit of cleaner over the nozzle.
If you are just swapping from one to the other the gun does not need
cleaning - just the can (above).
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IME you are better not taking the can off the gun unless you need to. It
will stay usable for quite some time by simply clearing any foam off the
end of the nozzle prior to next use. (note however this may vary with
gun quality and variability - others have not had the same success as me
If you take the can off the gun, the can does have a valve (but probably
no better than the one on a "normal" can - so don't expect a started can
to last that long if left unused. You will also need a can of cleaner to
flush the gun through.
I picked up and used a gun that hadn't squirted any foam out of the
nozzle for six months, since I last used it in the back room
walls/insulation. It was fine - just cleared off the end, turned the
knob and pressed the trigger.
Yes .. if attaching to another can of foam no problem ... if not going
to use for some months better to clean .... attach it to a foam cleaner
car and spray until clean.
Be warned make any changes outside ... neighbour did this but ball valve
had stuck so it sprayed everywhere, and the more he tried to reattach
the gun the worse mess, in the end he just left in on the floor - it
seemed to be expanding for Hrs.
He hands arms & hair were hell of a mess ... and as you know it don't
come off easily.
On Tuesday, March 26, 2013 12:31:38 AM UTC, firstname.lastname@example.org wrote:
I had a can of drywall fixing foam on a gun and used it for its intended
purpose, but since I had some left, I am now using it for general expanding
foam applications. It is low expansion and a bit stickier and more dense th
normal expanding foam, which is usually an advantage. Presumably it is more
or less the same as the low expansion window fixing foam.
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