I am making a car cake in an 18 inch rectangular pan. I need to layer it so that it would increase in height and each layer is 4cm in height. Do I use dowels to support it? I will be making three layers. Also my first layer almost split in half. It has a huge crack in the middle. Do I use it as the base or middle? Or do I rebuke completely?
help please :( thanks
Glue it back together with ganache or buttercream. No need to rebake. And no, if it's only 12cm (5") tall, you don't need dowels. Make sure you cool it before you cut and carve it!
As the other poster said, the split layer can be used - glued together w/b/cream. I would use it on the bottom so the base board helps support the crack. Be sure to use a base board thick enough to support the wight - maybe double your usual.
You mention the cake being 3 layers tall....rule of thumb is use dowels to support any amount of layers over 4" or 5" tall.