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.
Prepare a cured, waxed polyester surface for another polyester application: identify the resin, remove the wax barrier, then create the specified bonding texture.
Prepare exposed cells on thick expanded PVC letters so the painted edge approaches the factory face without shrinking the letter.
Align a joined PLA model, fill the assembly gap, and level the cured repair without thinning the printed shell before using primer to check the shape.
Decide whether pinholes over resin artwork need a full coat, while protecting the thin clear layer above the image.
Level the raised material on a cooled ABS repair while preserving the original panel contour, then decide whether remaining low spots need filler.
Decide which acrylic edges need accurate bonding surfaces and which can be polished, before rounding a joint or adding flame-polishing stress.