Technical & Reference Section > Tech and Restoration

Anodised Crank Arms, Blue Doesn't Match. Darken, lighten or remove?

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BMX1973:
If your not going to use them at the moment, try this. Or if you can hold on until the summer even better. Then you can retain the original finish.  :daumenhoch:


--- Quote from: MartyC on December 13, 2015, 03:15 AM ---The anodising fades in sunlight/uv so try placing the darker one on a window sill that gets a lot of sunlight for a few weeks  :daumenhoch:

--- End quote ---

Wayne Ryder:

--- Quote from: BMX1973 on December 13, 2015, 07:58 PM ---If your not going to use them at the moment, try this. Or if you can hold on until the summer even better. Then you can retain the original finish.  :daumenhoch:


--- Quote from: MartyC on December 13, 2015, 03:15 AM ---The anodising fades in sunlight/uv so try placing the darker one on a window sill that gets a lot of sunlight for a few weeks  :daumenhoch:

--- End quote ---

--- End quote ---

Thanks everyone, this is all useful stuff. There is a noticeable difference in shades of blue, unfortunately.
The UV fading might work, but will probably take till next September. I tried this on a pair of shoes, one of which I'd not noticed had some display fading. Didn't really work on suede. I can't help wondering if anyone I know has a sun bed...

oldscool:
Spray on oven pride works. Spray it on as fast as possible so its on an even length of time an clean it off quickly, Keep doing it until you get the shade you want.  :daumenhoch:

Wayne Ryder:

--- Quote from: oldscool on December 14, 2015, 09:52 PM ---Spray on oven pride works. Spray it on as fast as possible so its on an even length of ttime an clean it off quickly, Keep doing it untill you get the shade you want.  :daumenhoch:

--- End quote ---

That sounds just like my kind of method. Might give that one a punt.

Chris123:
Using sodium hydroxide to try and fade anodising is a stupid idea. The dye is trapped in the anodising, removing the top of the anodising will open the pores where the dye is contained, it'll all come out, you can't control how much you remove!

It's unlikely two weeks in the sun will do anything, perhaps you could leave them there for a couple of years on a kebab rotisserie so they are evenly faded????!!!!

Get them re-anodised at a company that is used to re-anodising parts.

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