Make polymer identification, cleaning, adhesion promotion, and a complete-system coupon the main decision rather than relying on a rough surface alone.
Trim only proud adhesive or damaged edge fibers, using sacrificial guides and low heat instead of treating soft foam like rigid plastic.
Restore optical consistency while separating polishing from the separate decision to apply a compatible UV-protective coating.
Treat exposed fibers, cracks, soft spots, and impact marks as structural inspection findings, not ordinary sanding defects.
Separate removable surface haze from hard-coat failure, crazing, and deep damage before any abrasive touches a flight-critical canopy.