"I never use a gun foam cleaner and I don't recommend it to you."

In a private house there is always some kind of gap or hole that needs to be foamed, and I am sure that almost every home craftsman has a polyurethane foam gun for this purpose. Of course, for one-time work, you can do with ordinary foam with a tube - adapter, but the gun has a number of advantages. It consumes foam much more economically due to the pressure regulator, it is much more convenient for them to foam even the smallest crevices. And most importantly, the foam that is intended for pistols does not expand as much as the usual (with tube), which is of great importance when installing doors and windows (using ordinary foam, the structure can spread).

The only nuance of the gun for polyurethane foam is its content, namely cleaning and storage. And as it turned out, I was doing it wrong.

Previously, after using a gun, I always rinsed it out of polyurethane foam (I used a special foam cleaner based on acetone for cleaning).

But, no matter how thoroughly I washed the pistol, after 3 - 5 uses it failed and I always blamed on the quality of the instrument itself, but it was not about it.

Once I went to my neighbor to ask for a dozen long self-tapping screws. Mikhalych is an experienced builder and a thrifty person, he always helps me out in such situations. On the wall of his workshop, I noticed a pistol all stained with polyurethane foam and with a twisted cylinder. "Mikhalych, why didn't you clean the pistol? The foam will dry up! Shall I give you a purifier? "I asked him. The neighbor looked at me with a smirk and said: "I never use polyurethane foam cleaner and I do not advise you".

And here he told me how to properly store and clean the foam gun. It turns out that acetone has a detrimental effect on all rubber seals inside the gun and over time it comes out of tuning (this is even indicated on the operating instructions for the instrument, I never paid attention to this inscription, but in vain).

After installation work, Mikhalych does not clean the gun and does not unscrew the cylinder, always leaving a little foam there (if the foam runs out, he winds up a new cylinder immediately). In this form, he keeps it until the next work.

When the gun is needed again, he simply brushes it on the metal.

And it cleans the nozzle itself well with an ordinary needle.

And that's all, you can get to work. With this storage method, the foam will not dry inside the gun even after a year and no cleaner is needed. So, live and learn!