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Confused with sand paper and film polishing grades


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Hello

I just got my shipment from Cousins and I am just confused with grades. I will use different sand papers and films to polish watch cases and bracelets. So, I have this:

P800 sand paper Matador Siliciumcarbid
P1500 sand paper Matador Siliciumcarbid
60 microns polishing film (3M Microfinishing Film Aluminum Oxide 5 Mil 272L)
9 microns polishing film (3M 3M Microfinishing Film 268L)
Dialux Green with Dremel

The polishing film that I mentioned above (60 microns) is way too coarse and feel like P200 (that rough). Did I ordered something wrong?

Also, I have one old sheet of Silicon Carbide 800/2400. I would say it feels like P1800 or something, but not sure and have no idea how it compares to the sheets above. Any help?

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24 minutes ago, bojan1990 said:

Hello

I just got my shipment from Cousins and I am just confused with grades. I will use different sand papers and films to polish watch cases and bracelets. So, I have this:

P800 sand paper Matador Siliciumcarbid
P1500 sand paper Matador Siliciumcarbid
60 microns polishing film (3M Microfinishing Film Aluminum Oxide 5 Mil 272L)
9 microns polishing film (3M 3M Microfinishing Film 268L)
Dialux Green with Dremel

The polishing film that I mentioned above (60 microns) is way too coarse and feel like P200 (that rough). Did I ordered something wrong?

Also, I have one old sheet of Silicon Carbide 800/2400. I would say it feels like P1800 or something, but not sure and have no idea how it compares to the sheets above. Any help?

60 microns is about P200 grit

https://www.fine-tools.com/G10019.html

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Posted (edited)

This is the tutorial from Nicholas Hacko: http://www.clockmaker.com.au/rolex/rolex_case_polishing.html

 

"Step 4: More of the same. Medium: 3M Film sheet polishing (plastic)
grade 60 microns and 10 microns (2-3 minutes each).
Available from jewellery suppliers only. On touch 3M film eels like ordinarily
plastic sheet, definitely not your ordinarily sand paper :-)"

 

Also, I still have no idea what is Silicon Carbide 800/2400. It is probably P2400 but that 800 stands for?

Edited by bojan1990
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Over multiple decades of wet and dry sanding I have always got confirmed what I was told on the 1st day: the markings are just an indication, if you like how it does and how long it lasts then buy more, otherwise just get something else. 

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