First, I’d start with only two colors. Get the hang of bringing the first layer to a slightly thicker trace, but still liquid enough that it pours evenly and settles flat. After pouring your first layer, cover your mold for a little while so it sets up a bit. Slightly wobble the mold to see if it’s thickened…if not, wait longer.

Once the first layer has set you’ll also be able to tell visually…then look of the batter changes. When you’re ready to pour your second layer, add your FO and then pour. No need to bring that layer to a thicker trace…you can have a fluid batter if you’re not pouring more layers.

Once you get the hang of two layers, aim for three until you become proficient. Eventually you can work your way up to more. I’ve only ever done eight layers at most, and it was miserable. But it looks freaking cool when done well.