I suggested using clear varnish, and here are the 'comparable' results - mind you, the black one has been in use for 3+ months while the unicorn edition has been with me for just a month and I probably was a bit more careful with it than my girlfriend with the black one tho I didn't hesitate to put it on a table or whatnot.

Also, images taken free-hand under poor lighting with the N900's camera so don't expect great amount of details, but the difference is pretty much obvious: https://picasaweb.google.com/sxdesig...eat=directlink

What is not shown on the images is that the white one has a small scratch as well (visible only under intense light at extreme angles) that will have a tendency to flake in the future - it's not a scratch on the metal plate itself but on the clear varnish coat on top - once those scratches become more prominent the fix will be easy - just remove the clear coat and re-apply it again. When it comes to the visual appearance, the reflectivity is pretty much the same, although the 'varnished' one appears a tad bit darker and milkier (barely noticeable, tho - you need another pristine N9 side-by-side to see the difference).

As for how to do it - you don't need any special guide, the process is dead simple:

1. Clean the plate thoroughly with soapy water and a cloth that leaves no fibers
2. Dry it really well (I used a hair dryer)
3. Mask everything else with tape
4. Mask the lens really well (I used several layers of tape and a small cotton ball at the bottom)
5. Spray evenly with uniform side-to-side motion about 2/10 mm of clear varnish on top of it (depends on the spray nozzle and how fast you move it should be about 2-3 passes)
6. Wait about 5 minutes and spray another coating layer to even it out
7. Wait at least an hour for it to settle down and cure (this, of course, depends on the varnish you used)
8. If it somehow got to the places you didn't want (look at an extreme angle with powerful lighting will show it), remove the varnish carefully with some acetone or other mild thinners that can act as a solvent for the varnish you used

That's pretty much it. I used a clear varnish that I use to fix my rims after I curb them, but any varnish that doesn't affect the color and doesn't affect the reflectivity all that much should do. Don't use wood-only varnishes, tho, as they might not stick to the plate (it's extremely polished so even metal/plastic varnishes hardly stick to it). Also, the coating can make it appear even worse if it's already scratched - you might want to polish it with some mild abrasive polish paste first.

And, of course, do this at your own risk, it worked for me but I cannot guarantee it will work for everyone.

Good luck