Should I paint each piece separately before or after installation?

Paint before installation. Masking around mounted panels is tedious and creates overspray risk. Lay out all four pieces, sand and prep the primer surface, apply your base and clear coat while flat, then install once fully cured. This also makes touch-ups easier down the road.

Do I need gap filler tape between the panels and factory body?

FRP kits benefit from a thin bead of color-matched flexible sealer along seams where panels meet factory plastic or sheet metal. This prevents dirt and water intrusion. Whether you use tape or sealant depends on your finish preference — either works. Budget for this as a separate consumable.

Will I lose access to factory jacking points or mounting brackets with the side skirts?

Before installation, verify that side skirt placement does not interfere with your vehicle's factory jack pad locations. Depending on geometry, you may need to cut a small relief or use a low-profile jack pad. Reference your owner's manual for exact jack point locations and test-fit the skirts in place first.