AHi, I have a problem, I made a cake size 18"x18" but my oven small and can not fit such a big cake pan. So i used cake pan size 9"x9" to bake and joined the cake together until i get the desired size. After that i wraped with fondant . After a while the fondant started to sink in between the join. Anyone have the same problem like this and any solution. Please advised me because now i need to do another one and don't want to face the same problem Thank you in advance

I always mix some cake crumbs with some ganache into a stiff paste and then seal the joints, much like a bricklayer does with bricks. Make sure the cracks are filled completely otherwise it will sink again. Let this set properly and then do a normal crumb coat. it should then look like one cake.

HTH

AThank you so much. Your advised very useful for me. :D