Any advice for color matching Lagoon Blue interior color?

Just a note...

If you are pre-finishing vinyl, you have to be very careful of what type of paint you use on it. Some laquer paints can actually deform the vinyl coverings.

Use products specifically formulated for plastics/vinyls.
well, I painted all the faded hard plastic parts (door tops, A pillar trim, kick panels, seat end caps) back in '91, like i said with engine enamel. I am hoping to find or get mixed some for vinyl, as my headrests are in great shape, except the outside 1/3 is severely discolored from the sun.