Will this lip interfere with my trunk seal or bumper fitment?

No. The lip is designed as a clean lower-fascia accent that sits independent of the trunk or bumper assembly. Confirm proper gap alignment during test-fit before final installation.

Can I drill through this for additional fasteners, or should I stick with adhesive?

FRP tolerates both methods well. Adhesive alone is sufficient for factory mounting points; drilling is optional if you want added retention. If you drill, use a corded rotary drill with a 3/16-inch bit and seal the hole with epoxy after fastening to prevent water ingress into the composite.

How do I prep this for paint?

Sand the surface with progressively finer grits to open the finish, then wipe clean and apply your chosen base coat and clear. The FRP gelcoat accepts automotive paint finishes without additional etching or bonding primer.