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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 12-08-12, 08:49 PM   #1
rbarelas
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Painting a Crank

So I have a crank its silver i kinda want to paint it, but I want to do like a drawing on it. I have no idea how to do it. do i sand it down first, or can i throw the paint over it, I had an idea on how to do it, my idea was primer over the crank, then a solid white, do the painting/drawing, then a clear coat over it. does that sound right? can you help me out?
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Old 12-08-12, 09:32 PM   #2
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Sounds good. Just remember it is a crank and portions of the paint will rub off. I love it when people get creative with their bikes.
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Old 12-08-12, 09:44 PM   #3
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Powdercoat will stay a lot longer than paint. But it'll be a lot more expensive.
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Old 12-08-12, 09:46 PM   #4
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Cranks are normally aluminum, so they don't powder coat very well.

****ty finish.
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Old 12-08-12, 10:01 PM   #5
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Paint doesn't do too great either unless it's primed.
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Old 12-08-12, 10:31 PM   #6
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You need to know what you are starting with - are the cranks anodized? You want to remove all that which involves some chemicals or a lot of abrasives. Probably both.

To get anything better than a flaky job you'll need a chemical reaction. So either two part catalyzed paints, heat-cured paints, or something that reactions with the aluminum itself, like a darkening agent.
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Old 12-08-12, 10:58 PM   #7
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Or spray paint.

"BFSSFG: Over complicating the uncomplicated."
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Old 12-08-12, 11:06 PM   #8
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Painting them makes them heavier dude. You wanna go the other way fer sure.

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Old 12-09-12, 03:26 AM   #9
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Acidwash/fade/splash anodizing. I say this just because I haven't seen much exotic anodizing work in the cycling industry, it all seems to be solid tones.

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Old 12-09-12, 08:36 AM   #10
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Or spray paint.

"BFSSFG: Over complicating the uncomplicated."
And you don't need to take the cranks off the bike. Leave the pedals on too. Just spray around that stuff.
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Old 12-09-12, 08:39 AM   #11
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Powdercoat will stay a lot longer than paint. But it'll be a lot more expensive.
+1 this. Maybe find a bunch of other people who want to do their cranks as well and get them done all at once so you can split the cost.
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Old 12-09-12, 09:38 AM   #12
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^ I must be lucky, there's a powdercoater near me that does frames for $50-75 and parts like h-bars and cranks for $15-20

also,this is amazing
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Old 12-09-12, 01:45 PM   #13
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Painting them makes them heavier dude. You wanna go the other way fer sure.

Wow - On the right bike, that would look very nice.
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Old 12-11-12, 08:32 PM   #14
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so this is the finished product, so what do you think. nothing will happen if i clear coat it right?
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Old 12-11-12, 08:37 PM   #15
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You painted it without taking it off the bike or even removing the pedals?
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Old 12-11-12, 08:37 PM   #16
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so meta
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Old 12-11-12, 08:45 PM   #17
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Painting them makes them heavier dude. You wanna go the other way fer sure.

THat's nice.

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so this is the finished product, so what do you think. nothing will happen if i clear coat it right?
That doesn't look right.
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Old 12-11-12, 08:47 PM   #18
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You painted it without taking it off the bike or even removing the pedals?
well yeah, seemed pretty easy.
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Old 12-11-12, 08:47 PM   #19
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What about Shenron doesn't look right?

dragon balls yo.
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Old 12-11-12, 08:48 PM   #20
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THat's nice.



That doesn't look right.
Ouch, well, i like colors. so yeah
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Old 12-11-12, 08:50 PM   #21
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What about Shenron doesn't look right?

dragon balls yo.
THANKS MAN!, you get it.
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Old 12-11-12, 08:51 PM   #22
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so this is the finished product, so what do you think. nothing will happen if i clear coat it right?
Dude, it totally depends on how you prepped it, what you used for the artwork, and what you use for the clear coat. As those are all single-speed-fixed-gear-specific questions you came to the right place!

First, prep the artwork by spraying it with mineral spirits. Then rub it really hard with steel wool soaked in Acetone. Finish off with a soft cloth with a bit of Naphtha or Methyl ethyl ketone (MEK). That should be all you need!

Last edited by Bat56; 12-11-12 at 08:51 PM. Reason: My bad, I listed what NOT to do. I did not understand the question.
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Old 12-11-12, 08:51 PM   #23
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What about Shenron doesn't look right?

dragon balls yo.
Huh?
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Old 12-11-12, 08:51 PM   #24
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it's going to rub off when you ride regardless of whether or not you clearcoat it.
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Old 12-11-12, 08:52 PM   #25
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Huh?
It's Shenron, from Dragon Ball Z.
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