After a lot of experimentation with how to apply dye, I came across the Molotow transformer markers. They have a 250ml bottle where you can attach a 50mm wide head. This works really well and compared to soaking a rag with dye there is almost no mess. A friend of mine once told me that leather dye will make a HUGE mess if you were to spill it all over your table. This has off course never happened to me as I am very careful and never make mistakes.
What ever method you chose it takes some time to dye a piece this big and you have to go over the same spot multiple times. I try to divide the piece into smaller sections and take one at a time. Unlike using a rag, going in a circular motion does not work well. You need to go back and forth, up and down, and if you're feeling wild you can even go diagonally.
