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.
It takes about a night to dry. If you need it to dry faster you can increase the amount of vodka.