Advertising. Find a products weakness and then push it as it's strength.
You must be talking about "Great Stuff". You may have bought it at
the Despot. That is often a clue as to an innate problem. The Despot
will sell all manner of crap.
What a mess clean up is and you don't want to get any of it on you.
DAP and others make latex expanding foams, you can clean out the
straw and nozzle with water. Not that that is any great joy but it is
reasonable. Not so with "Great Stuff".
I've used the pipecleaner-in-the-tube trick with varying results. [but
then I get a dead can about 10% of the time] Take the screw tip
off & use one pipecleaner in the top of the can. Use another in the
first section of the top. And another in the end of the tube.
If you're lucky all 3 will come out, and there will still be pressure
in the can.
A better plan is to keep a list of places where you can use a squirt
of it on the shelf where you keep you 'great stuff'.
Oh- for a can that won't spray, but still has great stuff in it? Stand
back 50 feet ad shoot it with a pellet gun. Pretty dramatic.<g>
I recently tried to use a can for a second time. I found that it was
relatively easy to push the dried crud out of the plastic dispensing
tube using a wire. It was the short shaft sticking out the can where
the problem is. I used a drill bit turned by hand to dig into that
shaft and pull out more crud, some of it semi-solid.
I eventually got it to the point where there was a constant small air
leak coming out of the can. I put the dispensing tube back on, turned
the can upside down, and a very weak but constant flow of foam began to
flow. I thing it would only flow if the can was upside down. I stuck
the nozzle where I needed it, rigged the can so it would stay put (and
stay upside down) and left it. I'll check today to see how much came
The official method, which was illustrated in the instruction book that
Great Stuff used to come with (along with a pair of gloves) is simple.
Unscrew the plastic nozzle and pull off the extension tube. Moisten
several toothpicks. Insert one into the can, and one into each end of
the nozzle and extension tube. When the foam dries, the toothpicks will
serve as handles to pull out the hardened plug.
It works well, although the tube is better done with pipe cleaners as
others have mentioned. And acetone from a squirt bottle will remove the
excess if used before it dries, although if you miss a bit in the can,
it will still plug up.
I use flat tothpicks with the larger end inserted into the holes. They
get a better grip than the round toothpicks. Wait a few minutes after
using the foam to insert the toothpicks, or the still-expanding foam
will push them out.
As the can clearly states this is for one time use.
However, if one cuts the straw in half and then cleans the nozzle
immediately with a toothpick or and then uses the rest using the other half
of the straw within 30 days or so it usually works for the second time.
Honestly, sometimes it does not.
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