I have used an overpriced Great Stuff Pro pistol and a cheap one (ARTISTORE brand). This one, the Foamnseal FNS 500, is definitely my favorite. The coating on it is really non-stick. None of the other pistols had anything like this, although the cheap one claimed to have one. I can rest assured that this will remain sealed for >30 days, saving a lot of money, time and frustration. I used a can or two of cleaner on the previous two guns because I couldn't trust them to stay sealed for more than a few days. I threw away the cheap one the first time it allowed the foam in the gun to set after a few weeks of inactivity. And I'm throwing away Great Stuff Pro now that I have this one. It's just not worth the cost and hassle of cleaning a gun when there's an alternative to almost never doing it for less than $30.
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