Most Yolŋu paint their yiḏaki with a specific brand of acrylic paint.
This brand is not easy to get everywhere and you often only need a small amount.
As a service I now offer 4 10cc cups with the 'Yolŋu colours'.
Black
Yellow
Red
White
1 cup is enough to paint a large piece of your yidaki and make it look tip-top again.