This is confectioner's varnish (scroll to middle of page): http://www.almondart.com/acatalog/Miscellaneous.html
Steaming the flowers can improve their appearance too - just hold them over a steaming kettle for about 3 seconds. Make sure you don't touch the petals while they are wet and watch you don't burn your fingers. Steaming gives the flowers a very dewy appearance at first, but this fades to give a very natural look to the flower. The effect is not the same as the varnish, which depending on the flower, can be a little too glossy.
Regards,
Cris.
http://www.cooks.com/rec/view/0,1813,157188-246205,00.html
you might wanna check this link
A confectionary glaze that is made using conf sugar and water and then they mix 50% pure grain alcohol to it. The lacquer is expensive. Its $35 a can. And it wont give you the appearance your looking for. The conf. glaze works well on leaves and some flowers. I recommend the steam method myself, on most flowers. They get a realistic looks to them.
You can buy the premade glaze also. I got mine from Beth at Sugarpaste.com
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