Tan, I always use the White Wings buttercake packet mix - it just gives such a good consistency and the colours mix through it really well. If you are going to so a six layer cake, you will need 3 packets - make the batter on pack at a time and then split it into equal halves and then colour each half. It is not hard by any means to do all six layers, but it is time consuming. One tip though - whatever tin you plan on using, make sure you have two of them so you can have two cakes in the oven at the same time otherwise it takes forever to cook. If you are planning on feeding a heap of people, then use one packet per layer in a large rectangle/square tin.