Have any of you tried this?? And do you find great success with it?

I've done it. It's a good way to stiffen buttercream without adding more powdered sugar.

I also used it to build up a rounded nose on a spaceship cake that I was covering with fondant--it worked great. I've filled in unexpected cake cracks with it and built up under sagging square corners.

HTH
Rae

It is quite common practice here. If you look at my Octopus and diver cake - the arms and feet are made with cake spackle as core and are covered in fondant. In my Dinosaur cake, the egg under the dino baby is again cake spackle covered with sugarpaste.
There is saying here "A good baker has no wasted cake" - meaning everything you cut off, slightly overbake etc. you can use as cake spackle or cake balls which use the same basis.

I have, and it's OK, but now I'm a setting ganache girl all the way!

What about using the spackle technique for only covering in buttercream? I want a very smooth buttercream, can't this work also for just that?

What is the technique? Dont think I've ever seen it, or atleast dont know thats the name of it...

I remember Macsmom posting that she makes a cakeball-like mixture and uses it for dams...I thought that was a cool idea.

Interesting...didnt know that...thanks for the info bob