If you have a scratched round acrylic crystal, no problem – buy an new one and replace it. It’s a bit harder if your crystal has an odd shape and is hard to come by. In that case, it’s elbow grease you will need!
This Tissot SeaStar crystal is pretty badly scratched. Let’s see what we can do.
Before you polish, you have to get rid of the deep scratches. So the first step is a 240 grain abrasive paper. Make sure you have enough thickness left on the crystal to get rid of even the deep scratches, it not, you will have to leave some of them.
As the crystal is standing proud of the case and there is no chance of damaging the case, I can leave the crystal in. Otherwise, you have to take the crystal out of the case.
Looks a bit like snow …
Next step is a 500 grain paper.
Always make sure you have a smooth surface before moving up to the next grain. After the 500, it’s 1200.
After the 1200 paper, you can see where this is going. Now we’re moving on to a 2000 grain.
Still milky, but getting better. The last paper we will be using is a 9 micron 3M lapping film.
After the 3M 9 micron lapping film. It’s still a bit milky, but a great surface for the buffing wheel. So I charge the buffing wheel with some Dialux vert, and take the crystal to it.
This is the last step. Don’t apply too much pressure, and rotate the crystal as you polish.
Not too shabby, and I’m happy with the result. Now you have to clean the case thoroughly to get rid of all the debris. You don’t want acrylic dust to end up in your movement!