Guide: How to repair / mask a scratch on a Black Anodised Aluminium (Lian Li) case

Coup27

Platinum Member
Jul 17, 2010
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I've become a big fan of Lian Li's Black cases recently, especially their mini-ITX range. I've used about 15 in the last year and apart from looking beautiful, they all seem to have at least one scratch on them from new. For my new Haswell build I decided to go with a Lian Li PC-Q28B. That case is not available in the UK so I had to import it from Germany. When I opened it I was looking for the customary scratch and was gutted to see it on the front panel near the 5.25" slot.

I didn't know where I stood on being able to exchange it but as I had to import it, the chances of being able to exchange it without further expense and a lot of hassle would have been slim. After some research and finding a lot of people with scratched Lian Li cases, the most common suggestion was sanding it out. I didn't need to ruin my case to know how much of a bad idea that was. The next most common piece of advice was "Anodised Aluminium can't be repaired so you will have to live with it." Well, I wasn't going to wear that either.

After going my own route I bought a product called Aluminum Black, by Birchwood Casey. This isn't a paint, it's a liquid dye that you leave on an Aluminium surface for 30-60 seconds before washing off. I spoke to Birchwood Casey and they said it was safe for use on Anodised Aluminium.

I managed to go from this:

Scratch1.jpg


To this:

Scratch2.jpg


Sorry for the enormous pictures but I've left them at a high resolution so you can see the finish clearer.

If you have a scratched Lian Li case and would like to do the same, here is how I did it.

Equipment
Birchwood Casey Aluminum Black dye

A small paint brush. (I managed to get a tiny brush from a cake decorating shop. I would go somewhere like that or to an arts and craft shop).

Latex gloves. The dye is poisonous if inhaled or absorbed through the skin

Washing up liquid (degreaser)
2 clean dish clothes
Paper towel
Microfibre cloth / duster cloth
Cup of water

Step 1
Make up a bowl of water and washing up liquid and put one of your dish cloths in it. Wet the other dish cloth with normal water. Degrease the scratch with the first cloth and then wash that off with the second. Dry the area with a paper towel and then buff it and remove any dust with the Microfibre.

Step 2
Apply the Aluminum Black to the scratch with your brush. Out of the bottle it is a clear bubbly liquid so just brush it on and leave it for 30 seconds. After 30 seconds wash it off with your water and then clean the area with your cloth with water on. Dry with the paper towel and then buff with the Microfibre.

Step 3
The first "coat" darkened the scratch a lot but I could still see it. I then reapplied for another 30 seconds. Washed off, dried and buffed. I repeated this procedure 4 times. After the 4th coat, the scratch was invisible and blends into the brushed finish.

When I spoke to Birchwood Casey they said you can put up to 5 coats of the product on an area but you will not see any change in results to go beyond 5 coats. They also state they product should only be on the Aluminium for 30-60 seconds maximum. I possibly could have reduced the number of coats I did if I had left it on for nearer a minute but that's a risk you need to decide on. The dye doesn't affect the Anodised metal, only where the bare Aluminium has been exposed by a scratch so this makes it a perfect solution to masking a scratch and due to the brushed finish, it's likely to blend into the case never to be seen again.

Obviously this was done before I built my PC so if yours is built you'll have to take measures to prevent the inside from getting wet. I hope this guide proves useful to some people.
 
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scannall

Golden Member
Jan 1, 2012
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Wow, great job. Being on the front of the case, you can't really let it slide.
 

Alan G

Member
Apr 25, 2013
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Many thanks! I have a Lian Li PC Q-27 that also came with a small scratch on it. This looks like a good product to use and it's cheaper than shipping the case back for a new one. My case already has a build in it but the scratch is far enough away from the OD bay that it shouldn't be a problem. I see also that the company makes a touch up pen that may be useful as well.
 
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aigomorla

CPU, Cases&Cooling Mod PC Gaming Mod Elite Member
Super Moderator
Sep 28, 2005
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now if someone can tell me how to remove stained finger prints from anodized alu...
 

aigomorla

CPU, Cases&Cooling Mod PC Gaming Mod Elite Member
Super Moderator
Sep 28, 2005
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Didn't you read the instruction manual? They discuss the use of white cotton gloves when handling the case..:biggrin:

so i buy a case to never be able to touch it..

Brilliant!!!

:biggrin:
 

spat55

Senior member
Jul 2, 2013
539
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Hope you don't mind me asking, but if they all come scratched why buy them? I know they seem to look good but there quality control seems terrible!
 

Alan G

Member
Apr 25, 2013
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Hope you don't mind me asking, but if they all come scratched why buy them? I know they seem to look good but there quality control seems terrible!
I think they get scratched during the packaging process and once they are boxed up; you cannot see the scratch. I've had three PC Q-27Bs and only one had a small scratch on it. Clearly a 33% flaw rate is unacceptable in terms of QA/QC but if it is not seen when the plastic bag goes over the case there is not much that can be done. Obviously one has the choice to RMA the case but that's an added cost and time delay that can be avoided by doing the touch up.
 

Coup27

Platinum Member
Jul 17, 2010
2,140
3
81
Hope you don't mind me asking, but if they all come scratched why buy them? I know they seem to look good but there quality control seems terrible!
I buy them because I like their designs and finishing. The 15 or so I have bought to date have not been for myself and none of the scratches have been in prominent positions and the client wasn't that bothered. They wanted a small compact stylish mini-ITX chassis and the Lian Li's fitted the bill. Sod's law that the one I buy for myself has a scratch on the front. I suppose you also buy them hoping that the next one won't be scratched!
 

Coup27

Platinum Member
Jul 17, 2010
2,140
3
81
Wow.. I think that I'll stick with a Sharpie.
Is it really that difficult to wear gloves and work in a ventilated area such as outside? That's standard procedure for most paints, dyes or stains.

The end result of this method gives a much better finish than a Sharpie, but at the end of the day you get back what you're prepared to put in.
 

Alan G

Member
Apr 25, 2013
127
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The product does not contain a dye rather a combination of agents that will cause rapid oxidation of the surface aluminum (which is why you leave it on for a very short period of time). MSDS for the product is here: http://sport.birchwoodcasey.com/files/MSDS/15125_15132_AluminumBlackA14_2010.pdf It is 94% water with smaller amounts of the compounds that do the actual work. It is prudent to wear gloves when handling this and also safety glasses. If you are using a small fine tip paint brush to apply the compound your risk of injury is small, just make sure to put the cap back on the bottle after you wet the brush to prevent any spill. Inhalation is only an issue if you are spraying it in large volumes.

I'm a chemist by education and I remember working with far more toxic things in undergraduate chemistry labs (but that was a lot of years ago and maybe things have changed).
 

CZroe

Lifer
Jun 24, 2001
24,195
857
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Hmm... I wonder how expensive would it be to color an entire Cooler Master CM Stacker STC-T01 (original CM Stacker).