I'm making a Fake cake for a wedding and was going to frost it with royal icing, the top layer is buttercream and real cake. Is there any way to add luster to the royal icing. I'm afraid that the layers won't match. Thanks.

Is it non-crusting BC? Will it be shiny? IF it crusts then it will have a flat finish much like the RI. If the BC will be shiny then I see what you mean! Could you brush it with piping gel? Not sure - maybe someone will have a better idea!

why cant you just use bc on the dummy layer?
i think the chances of getting royal to look the same as bc is pretty thin, especially if your bc uses butter and isnt actually white.
xx

I have to travel about 3 hours with it and wasn't sure how the buttercream would travel if it would crack or anything.

im not a bc persn really, but id be inclined to think that as long as its on a solid, and level base, it would be fine...
xx

it may differ from recipe to recipe, but when I put BC on a styro, it turns concrete hard. I can drive over a railroad track in a 4-WD going 75 miles per hour and that icing isn't going to do ANYTHING on that styro.

I love it at bridal shows and I tell kids, "Sure!! You can touch 'em! Go ahead!" because most displays have big signs that say "DON'T TOUCH OR DIE!!!"

thank you all for your answers

Indydebi - Can you share your bc recipe that hardens???  I need it for a dummy this week.