Will this lip interfere with the trunk seal or rear bumper when the door opens?

No — front lips mount to the front bumper only and do not contact the trunk seal or rear area. Installation uses the existing front bumper attachment points, keeping clearance unaffected.

Do I need to drill new holes, or does it use factory mounting points?

It uses factory mounting points, so no drilling is required. The lip attaches to existing holes in your bumper structure, keeping the installation non-invasive and reversible.

What should I do before priming and painting?

Sand and prep the surface with appropriate grit to establish good paint adhesion, then apply primer and your color coat. Reference your paint supplier's prep steps for best results. The FRP arrives ready for this process — no additional surface work beyond standard prep.