Do I need to paint each piece separately before or after installation?

Paint before installation. Sand and prep each panel, apply primer and your chosen color while they're still off the car — it's faster and you'll get cleaner, more even coverage. Once cured, bolt the pieces onto your vehicle.

Will I need gap filler or seam tape where the panels meet?

That depends on your installation fit and how you want the gaps to look. If you want a completely seamless appearance, seam sealer or FRP-compatible filler can smooth transitions after painting. If you prefer a clean line between pieces, tight bolt gaps are fine left as-is.

Does this kit include all the hardware needed to bolt everything on?

The kit includes the four body panels. Review your vehicle's factory mounting holes and attachment points to confirm your fastener needs — your OEM hardware or aftermarket stainless fasteners will secure the panels to existing locations.