Can a scratched watch crystal be polished?
If the crystal is acrylic or resin — which covers most vintage digitals — yes, and it's one of the most satisfying twenty-minute jobs in collecting. If it's mineral glass, no: glass needs professional equipment or replacement, and home attempts usually make it worse.
First, know what you have. Tap it gently against a tooth: acrylic sounds dull and plasticky, glass rings sharper. Acrylic also feels slightly warm; glass feels cold. Vintage Casios of the 70s-90s are overwhelmingly acrylic or resin; mineral glass appears on higher-end and newer models. When in doubt, check the model page in our database.
The acrylic method: a pea of polishing compound made for plastics (PolyWatch is the collector staple; plastic headlight polish works the same way) on a soft cloth, worked in firm circles for two to three minutes, wiped clean, repeated as needed. Light swirls and haze vanish entirely. Deeper scratches need a stepped approach: very fine wet sandpaper (2000 grit and finer) to level the scratch, then compound to restore clarity. It feels wrong to sand a watch — trust the process, acrylic is forgiving.
Where to stop: gouges deep enough to catch a fingernail firmly are borderline; sanding that deep thins the crystal noticeably. And keep compound away from resin case paint and printed bezel markings — masking tape around the crystal is thirty seconds well spent.
The good news vintage collectors learn: replacement acrylic crystals for common models cost very little, so even a failed polish rarely means a lost watch. A hazy, scratched dial window is almost never the end — it's usually the cheapest problem the watch has.
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