Will this lip affect my ground clearance?

The Vorenden style adds minimal extension below the factory bumper line. Check your driveway approach angle and any low-speed routes you frequent — mild ramps or steep driveways may require slightly adjusted entry angles, but typical street use sees no practical clearance loss.

Is FRP rigid enough to hold its shape, or will it flex under impact?

FRP is a rigid composite — it won't flex or sag under normal conditions. It's designed to absorb minor contact better than rigid plastic, but it's not a bumper guard. Curb strikes or speed bumps at an angle can cause damage; treat it like the aesthetic piece it is.

What prep do I need before painting?

Sand the surface with appropriate grit and wipe clean before applying your chosen primer and paint. Verify fitment against your factory bumper before committing to finish work — minor trimming of mounting tabs may be necessary depending on bumper condition.