The only problem is that from what I've seen the equipment can be quite expensive.
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From what I was told when I was asking about it, it costs quite a bit to make your own custom sheets. Like thousands.
I would guess that it's a special sheet of transferable dye that when applied with a chemical, releases it into the water which can then be dipped into.
Not to mention you have to have the proper primer and prepping equipment for the items you're working on.