watch glass cystal

[gary17]

hey guys.

been trying to remove a scratch from a watch glass. I used wet and dry that i had and the finest piece i had was 600. And the pic below show what i have ended up with. Is there anything i can do to save this glass? The glass cannot be replaced as no longer nade

cheers

gary

[grsnovi]

3M makes sheets that go all the way up to 2000 grit.

Is your crystal glass or plastic?

I would go increasing the paper grit from your 600, to 1000, 1500 then 2000. You don't have to but $25 at a time (you can probably get 3M wet-or-dry at your local hardware).

Then after you have the scratches out, polish with something like polywatch.

[jdm]

Have a read below. Hoowever, the crystal seem to be curved on an axis only, so it can be replaced with a blank or one of approximate size, then cut to measure.

 

7 minutes ago, grsnovi said:

I would go increasing the paper grit from your 600, to 1000, 1500 then 2000.

Even 2000 paper still leaves an haze. One need diamond paste for a perfect job.

 

7 minutes ago, grsnovi said:

Then after you have the scratches out, polish with something like polywatch.

Polywatch and it's equivalent mildb brasive compounds do little or nothing to mineral glass. They are made for plastic crystals only.

Edited June 2, 2022 by jdm

[steve1811uk]

Hi, there are some YouTube videos for glass polishing. It involves using grit paper to get the deep scratches out and then cerium oxide as a final polish using a Dremel type tool. Steve.

[gary17]

Hey

Thanks guys. 

[Paul80]

You need to go much finer than 600 grit, I go do 1200 then finish with a polishing compound applied with a felt wheel on a Dremel type tool.

Standard Polywatch does not on glass, if it's glass, they do a glass version that is a diamond paste, diamond lapping paste could also be  used, but I found the wet and dry and polishing compound route worked fine for me