"caulk Line" For A Seamless Edge With Buttercream
Decorating By __Jamie__ Updated 4 Nov 2008 , 1:03am by momma28
Since I see (and have posted many myself) questions about getting a seamless edge on my buttercream cakes after they are all stcked up, I tried this method yesterday, and it turned out perfectly. If this is not a new method, my apologies, although I know someone will come along today wondering how to get rid of that crack between their tiers.
1. Stacked my tiers, I had a 6" on top of an 8" on top of a 10", after I had frosted and smoothed and AFTER they chilled until really firm.
2. Chilled them all again.
3. Put buttercream into a piping bag with a number 2 or 3 tip...one of those.
4. Piped a continuous string of icing right along the edge of the tiers where the tier met the next tier.
5. Ran the tip of a tiny spatula along the line as if I was caulking the bathtub or something.
Now the cakes look seamless and there is absolutely no separation of tiers, they all look like one big cake. Pretty nice!
Do you chill them, then stack them, then you chill them again, stacked? And how long do you usually chill them for? Soryy, I'm clueless 
Thanks for the info, that always drives me crazy, and I had no idea how to make it smooth 
Oh...and I don't know how long I chill for, just however long it takes for the icing to turn fairly hard. Like if I touched the icing with my (clean) finger, and even applied a bit of pressure, there would be no give, or if I had to pick it up with cupped hands around the side, it would pick up fine without leaving any indentations or smudges. Make sense?
YES....Thank you. I'm doing a stacked cak on the 15th so this will help me sooooooooooo much!
Great idea will keep it in mind thanks for sharing
cool tip 
now if only someone could tell me how o get a nice sharp edge on my bc cakes. I know sugarshacks videos are wonderful but I have to wait to buy them so for now I am stuck with smooth sides and tops but the edges arent sharp. I am going to do a dance of joy when I get that down LOL
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