This is the product description on it, I had heard of it watching someone on tv use it on their gumpaste roses and other work
EDIBLE SPRAY LACQUER
A confectionery spray used to place a brillant shine on chocolate, marzipan, sugar showpieces and nougatine as well as other edible items.
Eliminates fingerprint marks and slight imperfections.
Lacquer spray neutral in smell and taste.
Protection from humidity.
Quick drying
Net weight: 12 oz./340 gram aerosol spray
I have used CK Products edible lacquer on gumpaste flower leaves for shine and stability. I also have a non edible variety used for spraying blown and pulled sugar pieces. It might be worth it if you were doing a lot of gumpaste display pieces that you wanted to keep for a long time. I don't know that I would use it on the flowers themselves, just on leaves that would be shiny in nature.
I got to try Nick Lodge's brand at a class I took in Phoenix. It's great stuff. The hilarious thing is the warning that's on the side, something about it causing major health issues if used a lot in a non-ventilated area. LOL
Rachel
I, too, have used spray lacquer in a Nick Lodge class. We used it only on leaves. Flowers and buds were dusted and then steamed to set the color and give them just a bit of shine.
Nick has a special spray mixture made up by Chefrubber.com. It contains more beeswax than the original Chefrubber product, so it makes things much shinier. Nick's has a blue cap, while the original Chefrubber product has a white cap. I can't find a listing on Nick's site (internationalsugarart.com), but I think if you e-mail them, they can ship it. I believe it's $7.99/can and it goes a long way, as you barely spritz each leaf. It's a great timesaver over individually painting each leaf with 1/2 strength confectioner's glaze (a mixture of confectioner's glaze and grain alcohol).
Personally, I love it.
Rae
That sounds like it would be excellent for chocolate pieces because the chocolate is so shiny and pretty, but if your finger touches it BAM dull and ugly! Hmmm... not toxic to eat, but toxic to breathe! 
That makes sense though. Eating it doesn't get it in your lungs!
I didn't ask, but I'd assume that the reason for spraying in a well venitlated area has more to do with the propellant used in the can than the lacquer itself.
I do know that after 24 students sprayed hundreds of leaves (using about 1.5 cans over a 45 min. period), there was an "odd" odor lingering in the air, but no one seemed annoyed by anything but the fragrance. It cleared up very quickly.
Sadly, most propellants remain troublesome for the environment--and also for overexposed human beings. Too much of some propellants make you sick, too much of others make you high 
Rae
The CK laquer I ordered came from Nicholas Lodge, but mine is in a hand pump spray bottle. Should add too that if all you want is a nice shine to the flowers leaves for a short period of time you can put a dab of Crisco in the palm of one hand, use an artists paintbrush and brush back and forth through the shortening. The warmth of your hand melts it slightly, paint it on the petal dusted leaves and then steam over boiling water. makes a nice sheen to the gumpaste leaf.
The propellants are highly flammable compressed gases, related to, if not, propane and methane. They are being used in place of the cfc's that have been damaging the ozone layer.
They are used because all those -ANE gasses are heavier than regular air, and sink, rather than float and destroy ozone.
It's often the same propellant used for some airbrushes.
Theresa 
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