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I haven't, but can all but guarantee that new covers will be an easier job with better results (if dying plastic seats is even possible), and not terribly expensive.
I used vinyl paint on my boat seats as a stopgap measure. It works pretty good, especially if the covers are in pretty good shape. The colored leather on a car is really just a similar vinyl type paint on most cars. Heck, most cars aren't even a full grain leather, they're bonded leather which is basically powdered leather glued together.
If you too the seats out, stripped them own, prepped well, I have no doubt you could do a good job with repainting them. That's what this paint is designed for. That said, it's a question of how much time are you willing to invest in it. I suspect you've got a good 20 man hours to do it all correctly. The paint isn't exactly cheap either at 20 bucks a can, and I think you'd want probably a can and a half minimum per seat.
I would diy install new covers personally as well, I did them on my c4 and got exactly what I wanted and they turned out great.
I dyed an entire interior in a older Chevelle from dark green to white. It turned out perfect! I used a products from SEM. Absolutely the best products for that on the market.
I sold the car seven years ago and it still looks like it was done yesterday. Prep and following the directions is key...
The dye will wear pretty fast on the parts of the seat with the most use. The drivers side outside bottom seat bolster will be the first to begin to wear off. hopefully the dye will not ruin your clothes over time. Just replace the skins and be done with it.
I agree,get new covers. I bought mine from Ridings and love them. My wife has a Lexus, and the leather is only 3 years old and needs some attention. I looked on the Lexus forum and a lot of people used dye to fix the problem. The seats look new after dying. Here's the dye they used. https://www.leatherrenew.com/
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