I specify that it is for small jobs for its small power.
I expect to see the behavior with the underlayers particular because I have tested so far with the glaze.
The briefcase format is more for storage and is convenient to have everything at hand even if it is a bit long. In addition, the second gun delivered is handy if you want to change color quickly without having to empty and clean the first.
it also helps to have a back-up gun should the first fail to work.