I seem to have a problem when I am painting gum paste. It seems to remain a bit shiny. I am using gel coloring and vodka (my husband expensive kind, eek). Am I just putting it on too thick? I am not sure it could go on any thinner. Could it be something else? I am looking for a matte finish, can this even be achieved when painting?
Gel color will leave it shiny. You can use petal dusts for a matte finish or if no one is going to eat it and it's all the way dry, you can color it with Crayola markers.
Paint it and get the look you want and then take a knee high white stocking or panty hose and fill it with powdered sugar and lightly dust your painted piece. It will absorb the moisture and give you a matte look but will only ever so slightly soften the color. Works with Corn Starch also but softens the color a tiny bit more.