I cover it with melting chocolate, then when it hardens go back with a knife and clean it up, then cover it again with melting chocolate, then smooth it with the warmth of my hands, then fondant 
I usually put my fondant directly on the RKT. You just have to make sure you get the surface really smooth. I use a microplane to file it down a bit. Good luck to you, there are few different ways to do it.
Modeling chocolate, like this blogger does!
http://sugarsweetcakesandtreats.blogspot.com/2010/11/toy-story-cake-and-cupcakes.html
i use BC cause that is what i usually have on hand. havent ever noticed any softening or sagging of the RKT. I dont usually make royal icing or modeling chocolate so i dont really want to make it special. If you just put fondant right over RKT its gonna be bumpy.
I use fondant directly on RKT. Never had a problem with smoothness; I use a little piping gel for extra sticking power.
Really? I dont understand how. I guess i am doing something wrong? Do you file it like the other person says or just pack and pack till its 'holeless'? I made a naughty cake once and used RKT and put fondant directly over the RKT and lets just say that HE looked like he had an STD. lol. I took off and covered in BC and smoothed and then put fondant over it! haha!
I cover it with melting chocolate, then when it hardens go back with a knife and clean it up, then cover it again with melting chocolate, then smooth it with the warmth of my hands, then fondant
this is how i do it too! and it works out beautifully. i did the nike shoe, beer bottle, santa's legs, etc. all with this technique. they're in my pics. smooth as silk the melted/hardening chocolate is good b/c it seals the RKT, unlike BC could. when BC comes to room temp, it's going to get soft. and it may or may not slide underneath, but hardened chocolate is never going to slide around at room temp. good luck!!!
I use fondant directly on RKT. Never had a problem with smoothness; I use a little piping gel for extra sticking power.
Really? I dont understand how. I guess i am doing something wrong? Do you file it like the other person says or just pack and pack till its 'holeless'? I made a naughty cake once and used RKT and put fondant directly over the RKT and lets just say that HE looked like he had an STD. lol. I took off and covered in BC and smoothed and then put fondant over it! haha!
Sorry, I just had a good laugh at what you said lol!! I always used BC on my RKT, never had a problem with sagging, I would refrigerate it for a few mins, smooth it, then get it super hard in the fridge, then do my fondant over that! Look in my pics if you want, the pregnant belly zebra cake was RKT, and so was the top dome on the Mario brothers cake!
bty upat2am, ur santa cake is awsome
you are so sweet! thanks it was so fun to do! it was for my sister's christmas party and i told her i'd make the cake (of course). it was so nice to get to make a cake however i wanted to...and what got done on it would get done and i wouldn't stress. my cake business is crazy, insanely busy right now (i'm not complaining!) and it was just nice to do something exaclty how i wanted to i fell in love with this cake! and it's so nice to see that so many others have loved it too!
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