I have a local paint shop mix my dye cans. Tethered are quite a few "resins" that vary the level of glossiness. What you want is a medium gloss resin additive to give it a fresh factory look. I just re-did the interior in my 86K10 Silverado and its a dead match colorwise. I prep my plastics with Dawn dishsoap and comet. Best paint prep I've ever used.