My armrests are faded from tan to a pink-ish color, which seems to be pretty common. I've come across another set of tan armrests and door panels, so I figure I can try dyeing those without fear of ruining them. Has anyone tried this before? I've seen good results with the SEM spray-on dye, but does it work on vinyl too? Or is there something else I could use?

If it doesn't work, let me know...I have at least a passenger side tan armrest.

ive used the duplicolor line with great success. it really burns into the material, it doesnt just coat it.
go with a flat or satin, and then it will shine with your favorite interior spray.
if you go with a gloss, it looks quite fake.
good luck.