changing interior colors
I used SEM products to dye the blue interior in my 68 Barracuda to black. Later I picked up a front seat that was white and dyed that to black with SEM. The stuff works extremely well. Only the piping on the edge of the seat where you slide in and out would wear off and would require touch up once or twice per year.
Use a ammonia based cleaner to clean all the parts several times. Use the vinyl prep on the vinyl parts and plastic prep on the plastic pieces. If you get any fishy eying you didn't clean enough, stop let it dry and clean some more.
The local auto body supply store was out of black dye so I tried Duplicolor dye from the local autozone. This stuff seems to stick and cover as well but it's much more glossy and does not look as natural as the SEM Landau Black.
You can get SEM products from your local autobody supply house or on line at Eastwoods.
If you check out my web page link in the sig line everything you see in the interior pictureis dyed except the carpet and head liner. I did all this back in 2000 and over the past two years I have replaced the upholstery on the seats (they split) with Legendary coversbut everything else is still the orignal dye job from 2000 (I have 50k miles on the car since that time to).