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Old 09-12-09, 10:23 PM   #1
Vinci
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Cleaning a machined seatpost?

I am cleaning up a Shogun 1000 for a friend and would like to get the components looking as new as possible. This Shogun came with an SR Laprade fluted seatpost, and it has some blemishes that could either be embedded grease/dirt or corrosion. Steel wool has not had any effect so far. It seems like the machined finish may be to blame.

Does anyone have any tricks for cleaning up a machined seatpost?

(borrowed image)
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Old 09-13-09, 05:04 AM   #2
Charles Wahl
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Machined posts typically have a finish composed of circumferential grooves; very difficult to clean well. Embedded grease/dirt could be removed by soaking in a strong solvent (mineral spirits less smelly, kerosene works better but smelly) and then wiping. For stuff that's truly corrosion, you might try rubbing compound (DuPont's is red) followed by polishing compound (white), possibly followed by Happich's Simichrome.
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Old 09-13-09, 05:12 AM   #3
Skones MickLoud
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Carb/Brake cleaner.
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Old 09-13-09, 09:10 AM   #4
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Try some super-clean or purple power in a plastic basin, mix about 50:50 with hot water and tie a length of string to the part so you can dip it easily. Let soak for a few minutes, and scrub with a scotchbrite pad or stiff toothbrush (follow the grain of any machined surfaces)

Make sure you remove any dissimilar metal, and wear rubber gloves, the solvent is a defatter and WILL pull the fat out of your skin.

When I run into an as-cast surface that won't come clean, I'll use aluminum engine paint if I want the look, sometimes black or another color to match/contrast with the frame.

Ken.
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Old 09-13-09, 10:39 AM   #5
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And while you're painting the top as Ken suggests paint in the flutes too.

It will look mahvelous.
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Old 09-13-09, 01:45 PM   #6
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Great ideas! I have several of those solvents/cleaners on-hand, as well as some silver engine paint. I was planning to paint the fluted sections as well, to match the frame.
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Old 09-14-09, 12:06 AM   #7
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If the machined section really refuses to clean up, you may need to just strip the anodize and repolish.

In rereading your OP I notice you said steel wool. Not so good for aluminum. Little bits of it can embed and will sit there and rust.

I like the look of those posts with the head and flutes painted to match.
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