Will this lip affect ground clearance or increase scrape risk?

The OEM Sport profile maintains factory-correct height at the front bumper. Ground clearance remains unchanged from stock. Your existing approach angle and departure angles are unaffected by the lip addition.

Is this rigid or does it flex under impact?

FRP is a hard panel material. It will not flex under normal driving. Significant contact or impact can crack the panel — typical of any rigid lip. Handle during installation and transport with care to avoid stress cracks.

What surface prep is needed before painting?

Sand the surface with appropriate grit to scuff it for paint adhesion, then clean thoroughly to remove dust. Follow your paint manufacturer's guidelines for primer and topcoat application. A quality primer coat ensures long-term finish durability.