Haven't tried it yet, but there is an Amerimist pearl sheen. I have some but haven't tried it yet. Supposed to be transluscent. Might be trying it on a cake today so I will let you know if it works!!
I'm wondering if you could use the crisco method to get that high gloss. Just rub a tiny amount on with a paper towel. I've used crisco successfuly on colored fondant. I don't think it would work if you have multiple colors airbrushed on, or want the color to go from dark to light.
Maybe you could steam it. I'm looking forward to hearing what everyone else says.
There is no high gloss product for the airbrush to get your cakes glossy..You can either steam them like Buddy does...or spray with everclear or alcohol but when it dries it goes back to being matte.There is a product out there that professionals use sold at kitchen and retseraunt supply companies called Spray Lacquer which is used to give the high gloss and preserve foods for show.It is expensive though at about $35.00 a can.
Pearl sheen will not give you high gloss but pearl...
Crisco will actually cause the fondant to bead if there is too much on there and the color won't stick to the fondant unless the crisco is wiped off really good..Lustre dust will glob in that spot no matter what if you have used crisco to smoothen the fondant..
Ask me how I know..... 
Ahh...PME finally put out something like that also..Great..That will work....cheaper too probably!!
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