Dash Pad Dye

I have a mint condition light green dash pad for my 72 Dart Swinger and I need to dye it Dark green. I believe my interior color code is GF7 if I remember right. I bought some of the correct color green from Mopaint a while back to use on the other interior parts. So I decided to test it out on a section of my old cracked-junk dash pad and it looks good, and is the right color. But it is no longer soft, it feels hard and textured now? So I am wondering were I can get a good dye in the right color for the good dash pad? Thanks for any help.