Step 10Place your first layer onto a cake board or cake stand. Spread a generous amount of buttercream over the cake and then drizzle 2 tablespoons salted caramel sauce on top. Place the second layer and repeat process. Top with the final cake layer. Cover the cake with a thin layer of buttercream and chill for 30 minutes. Add a final layer of buttercream to cover the cake. Use a large angled spatula to cream a smooth and even finish. Chill for another 10 minutes. Pour the remaining caramel over the top of the cake to create a dripping effect and sprinkle with more sea salt.