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
Satin Black is a matte black color that is dull in appearance similar to the OEM front grill of your 5th gen. It is a painted-on surface so it is smooth and easy to maintain.