Will this interfere with the trunk seal or weatherstripping?

No—this is a front lip mounted to the lower bumper area. It does not contact trunk seals or hood gaps. Verify clearance with your bumper's specific attachment points before final positioning.

Does this require drilling, or does it use factory mounting points?

It mounts to existing bumper attachment points without modification to the body. Confirm the hole locations on your specific bumper before installation to ensure alignment.

Should I glue this or use hardware?

FRP lips are designed for mechanical fastening through factory bumper mounting. Adhesive alone is not recommended for this application—use the existing holes and secure with appropriate hardware for your bumper type. Refer to your vehicle's service manual or OEM attachment diagram for fastener specifications.