I use the "My Little Steamer by Joy Mangano". I love it.
Rae
I spray on a lacquer ... 1 part piping gel to two parts water shaken until combined.
I would go easy on the steamer though, I have seen way to many ooey gooey melted looking cakes.
They always look so sad, like they've been crying.
I just spray my cakes down with a little vodka, it cleans up any cornstarch residue and after it dries leaves a nice matte finish. If I want a little shine I add some pearl sheen to it.
I personally don't like the wet look though, I have a few pics that are shiny but that's because they had been in the fridge prior to getting their pics taken.
That condensation evaporates and I'm left with a nice dry cake.
I would go easy on the steamer though, I have seen way to many ooey gooey melted looking cakes.
They always look so sad, like they've been crying.
Couldn't agree more. Shiny look for leather, things that are supposed to like plastic, anything at all that in real life is shiny is great--use that steamer! But for ordinary cakes??? 
For the love of God, step away from the steamer! I agree that if you need a certain effect you should use some kind of glossy effect, but shiny cakes just look like they're victims of humidity.Not good.
Oh, please pardon all the "CAPS"....a nasty habit due to eyesight....I totally did not take anything personally....thank you again....
Holy cow, I had to use a wireless keyboard that controlled a huge screen on the wall tonight at a meeting and my eyes are still crossed. I'm so nearsighted, I swear...
For that cake I personally would use some kind of a glaze that would stay shiny, not a steamer.
Maybe corn syrup thinned out and brushed on? It would be sticky, though. Here's a recipe for a dessert glazethta might work. I've also used confectioner's glaze before but it loses the shine when it dries out some.
http://cakecentral.com/cake-decorating-ftopict-666119.html
For shiny glaze I use a 40/60 mix of corn syrup and vodka then I paint it on the cake. If the item is a single color, in addtion to tinting the fondant, I add color to the vodka before adding it to the corn syrup. Mix well and paint it on with a good brush.
I used this method for the wine bottle in this cake.
http://cakecentral.com/gallery/1737944/wine-bottle-retirement-cake
It takes about a night to dry. If you need it to dry faster you can increase the amount of vodka.
The only problem with painting a glaze over that...or steaming it really...is that the colors may run, especially the colors you've painted with. Confectioner's glaze wouldn't make the colors run but I would really hesitate to paint that much of it onto something...it's edible but gross.
When you say "spray" do you use an airbrush or a squirt bottle?
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