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 Post subject: Polishing aluminium?
PostPosted: Thu Jan 20, 2011 7:55 pm 
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Hello

Im looking at mirror polishing my boxxers , the crowns are aluminium and the lowers are magnesium i think.
Just wondering what grit wet n dry i start with and what grit i finish with.
They have all been stripped and are bare metal.
Also have some autosol polish.

cheers

Jason


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 Post subject:
PostPosted: Thu Jan 20, 2011 8:54 pm 
retrobike rider / Gold Trader
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Depends how rough they are after stripping. You might be able to get away with some 1200 grade and then go straight to wire wool and polish.


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 Post subject:
PostPosted: Thu Jan 20, 2011 8:59 pm 
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EarlofBarnet wrote:
Depends how rough they are after stripping. You might be able to get away with some 1200 grade and then go straight to wire wool and polish.


Splendid , fine wire wool?
Will the polish get the scratches out that the wool will leave , also how about using p1500-p2000 wet n dry?


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 Post subject:
PostPosted: Thu Jan 20, 2011 10:52 pm 
retrobike rider
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if they are scratched start low and work your way up. Only problem is after you polish them - they will tarnish prety quickly. My bloomin cranks certainly do :evil:


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PostPosted: Fri Jan 21, 2011 11:52 am 
retrobike rider / Gold Trader
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I'd maybe try some 1200 grade wet and dry and see how that gets things. Then go to 1500. Some 0000 grade steel wool is really fine so shouldn't leave hardly and scratches. Polish with t-cut and then some proper metal polish. Job done :)


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 Post subject:
PostPosted: Fri Jan 21, 2011 6:05 pm 
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How long does the polished/shiny finish last before more polishing is required?


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 Post subject:
PostPosted: Fri Jan 21, 2011 11:06 pm 
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Lots of factors influence that :-( the environment the bike is used and stored in, how long cak is left on, the polish used (some leave a barrier) and IMHO the most influential, the grade of metal.

WD :D


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 Post subject:
PostPosted: Fri Jan 21, 2011 11:09 pm 
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As Wd says. Best option i have come across to keep my cranks from tarnishing is by alochroming then painting. Thinking of trying Nickel Plating but the nickel is very brittle, don't know if the cranks flex to much for that.


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 Post subject:
PostPosted: Sat Jan 22, 2011 1:15 am 
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Thanks for the info everyone , could you not get them clear powder coated or clear varnished?


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 Post subject:
PostPosted: Sat Jan 22, 2011 8:20 am 
retrobike rider / Gold Trader
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Certainly think you could laquer over the top of it. I'm sure manufacturers have done this before.


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