The amounts given are for a 12.5 cm tall palm tree (height of the tree trunk).
17.
Place the leaf on a leaf drying foam pad or on a regular foam pad in a slightly curved position as shown in the photo. They should hold the shape by now, but if they are floppy you can support them with pieces of paper towel. Make 5 more leaves the same way (+1 or 2 spare ones just in case you need them).
Leave the leaves to dry. Keep on checking them from time to time if they are firm. I left them to dry for about 1-2h but it might take longer for yours to dry depending on the humidity.