Primer is an unfinished surface that will require a final sanding prior to painting. Primer is a great option for those looking to customize and/or paint the parts themselves or have a body shop handle the paint. Primer is not intended to be installed as is on a vehicle. There are no UV stabilizers in the primer coating and will, therefore, degrade over time when exposed to sunlight.
Gloss Black (GBA) is your standard high shine black paint finish. Gloss Black is the go-to finish for ground effects and accessories as it will highlight the components against your colored car.