https://www.jalopyjournal.com/forum/threads/carpet-dye.1149851/ Older thread, even is Blue! I'd also look into detail forums if it's more high end than trying to get another couple years out of an occasional cruiser. They have to deal with picky owners of expensive cars.
I've done it a couple times when I was young and poor, once to change the color and once to renew the color. I mixed rit dye in a larger spray bottle with water, sprayed the carpet down starting in the middle and with a stiff bristle washing brush worked the dye deep into the carpet and slowly worked my way out to the ends. I kept the carpet wet, working the color in as I went and adding more spray as I needed it. Worked really great in both cases. The carpet was still in the car in both cases so I did them in the middle of summer where it was in the 90's temp wise. Did them at nite and pulled the battery cable and left the doors open all of the next day to let them dry. After they were good and dry, a couple days later I went and checked for missed or thin color spots and did touch-ups with the brush and spray bottle again.... ..
My buddy used spray bomb upholstery paint from SEM to change his carpet and door panels from tan to black about 8-10 years ago. I knew it would work on the door panels, but I was a little skeptical about coverage and longevity on the carpet. It worked great, and still looks good after all these years.
I used a SEM product many yrs. ago on a light tan carpet that had dark permanent stains. I figured that it was worth a shot, purchased a pint of darker brown, put it in the airbrush and worked it with neoprene gloved hands. Stayed somewhat pliable and was still good 10 yrs. later when I sold the truck.
Hello, Hopefully, your faded blue carpet is not a huge area. Our usage of a spray to cover a black carpet in one of our old cars did the job, but it was just a foot well area and came from an accident with lacquer thinner. I stepped on some thinner and then waited for it to dry, before getting in our car. The thinner did not dry fast enough and left some marks on the material. The black fabric spray did a good job of coverage like new. (Two light coats.) That was one. It was fixed with a black carpet spray and not a pure color match if it were red or blue. Eventually, usage started to wear the color off, it was paint after all. So, the next application was a liquid RIT dye we had used for clothes repair. When any household bleach got on pants or plain shirts, the RIT clothes dye worked to cover up the color offset. But, again, it was black and not any color matching. It has not changed much since those early days... But, it does soak the fibers and not just a top spray coat. Jnaki The commercial products are there, but the color matching will be difficult. YRMV
I touched up the carpets on an old winter beater with regular old spray paint and it actually worked pretty well. My carpets were black so matching the existing color wasn't an issue, since yours are blue it would probably be more difficult to find an exact match.
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