@Pastry Passion
Krebs used to produce the B&D paint guns also ;-) (And Bosch).
You may have one with a removable screw which suggests it is not a modern cheap paint gun made in China- they don't allow you to seperate the electrical components so that the rest can go into the dishwasher. In terms of nozzles, in addition to the amount of power, you can get different finishes and areas of spraying based upon the nozzle size and shape.
@Meezenplaz
The krebs food gun doesn't work on gravity- rather they use electric to spray even very thick materials like jam, chocolate, egg etc. Very powerful.
Apart from quality, the main issues with chinese mass produced electric paint guns is that the container and other plastic components are not food grade. This is why sometimes you get that plastic taste on croissants etc.
At the end of the day, whatever works for you, works for you. It just seemed prudent to point out that there are choices today for spraying food materials that don't require the pastry brush, cheap paint gun, or expensive compressed air solution.