You need to compact your RKT more if possible. Some people use chocolate to smooth it out, but maybe just add some stiffer BC and/or try using thicker fondant so that the bottom of the fondant helps fill in the cracks but everything else stays smooth on the outside
Don't know if that helps
There was another post on this recently where someone said they use a microplane to "file" the bumps off their figure before covering in fondant. Then they used the shaving dust to fill in any holes. I haven't tried it, but sounds like a great idea.
If it is too late and you can't do that, try a thin layer of fondant to cover the bumps, then another thicker layer to get a smooth finish.
HTH
For my 3D cake figures using RKT, I cover with melted candy melts. I use a pastry brush and put on several coats until I'm sure that all holes are filled. Then I let it sit long enough to be sure that everything is solid and smooth with a hot knife. I brush the figure with a little apricot glaze or thinned corn syrup before applying the fondant to ensure a good "stick." I've had really good luck with this and get a really nice smooth fondant surface. I just couldn't get there with buttercream.....
I made ZhuZHu pets with RKT and didn't have luck with the BC under the fondant. Try freezing it before applying the fondant so that the BC is nice and hard. I would suggest ganache. That works the best and is easy to smooth with a hot spatula.
Also, process your cereal next time so there is not large bumps.
Stephanie
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