Hi Geoff,
I have dug out this recent, (within 6 months) picture of the sky blue GT6 seats I coloured black, they are out of the car as I am/was restoring it.
I cleaned up the seats for the picture but the black is still all there, with no hint that they were any other colour.
they have had two or three years of constant use since I did them.
They do look a bit battered, but the car is 42 years old.
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