Like the Loop Maxi 600ML, the Loop 400ML is another professional tool for writing and great for low-density graffiti. You can get a really wide range of coverage with this tool, even though it looks really small. The modulability of this spray can is also great as well, so it’s going to be very versatile depending on your needs. The valve is made for more soft graffiti just like the Maxi 600ML and probably won’t perform too well on the harder projects that require more intricate detail. The pressure is relatively low while providing enough pressure to create a lasting impression that dries fast.