Yes...the button controls the color to spray light or dark.or rather soft or heavy.

The KromaJet said that it had a single air pressure and you adjust the color so yeah I guess you only have one air speed and different amounts of color. So with the airmaster, you adjust the airspeed, and then the finger button adjusts color, right?

Basically you leave the pressure on the compressor alone. Double action means that the button goes up and down to control the airflow strength. It also goes forward and backward to control how much color is released.

To see if you even like it...You might try getting a used compressor and buying an airbrush from a craft store.... I have NO experience with this brand but I found a reasonable price here: http://www.hobbylinc.com/htm/hca/hcahcar4012.htm

Hmm. I know I'll like it, I like anything cake.

I do want something that won't force holes in icing either...

I am thinking maybe I"ll just save up for the airmaster...except after colors and cleaner, etc and shipping it will be close to $300!

I was surprised that edible imaging stuff is actually a bit cheaper...that's my next project haha.

Both the Kroma jet and Airmaster are designed not to blow holes in your icing but of course if you get too close to the cake it may!!! Good Luck in your adventure for more cake toys!!!

Okay so what function exactly does being able to adjust air pressure play?

I would think just being able to turn it up or down depending on what project you are doing but maybe someone else has a better more clear answer than I...Sorry!!

If you have delicate work with lots of detail, you'll want to get closer to the icing to get a sharper line (more fine control). Too much air pressure will blow your drawing lines away or put a hole in your icing. If you are filling in a large area like the whole cake, you would move back, turn up the air and get a broader, more even coat.

the kromajet says it can do fine lines but how could it without change in air pressure?

Thanks Jenn for the explanation!!

Fine is a relative term? You can get a fine line with any airbrush but you have more control over it with a double action airbrush. I use a single action right now and get acceptable results with it. It just annoys me because the air constantly comes out of it and you can't stop it or change it except at the compressor. It is always blowing my lines around before I can get into position. I used to have a double action and will be buying another one soon. The air can be totally stopped on it until you start it with the trigger (at least mine was this way). Then you can spray a fine light spray in a very specific area and won't have as much overspray.

If I buy a brand new airbrush pen, is it okay to use my husband's compressor which is sitting out in the garage? Or does the compressor have to be new (for food purposes).

I use the one in the garage. Be sure it doen't have a device to automatically drip oil into the air line. This is used with some air compression tools.

Also, turn the pressure down low enough or you will blow your airbrush off the hose.

Ok, Jenn - let me make sure I understand you correctly ... you're say that you do think I could ahead and use the air compressor my husband already owns w/out contaminating my cookies? That would really cut my investment down nicely!

Yes, you can use his compressor. Just be sure there isn't a little drip device the adds oil to the airflow. Does he have air powered tools (like a nail gun) or does he just use it for blowing up tires?

I have a question about the compressor unit. I saw some nice little compressors at Habor Freight for real cheap but I didn't know if I could use it becuase I didn't know it the preassure would be the same as the KOPYKAKE ones.