Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 10-02-07, 05:42 PM   #1
dai
Junior Member
Thread Starter
 
dai's Avatar
 
Join Date: Aug 2007
Bikes:
Posts: 18
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Combatting Rust on a CroMo Steel Frame

Hey, I have an 80s Fuji Roubaix with a steel frame that has accumulated its fair share of dings over the years, especially on the underside of the downtube (from contact with rectangular bike racks for years) and I was wondering - Is there a product I can apply to prevent rust on exposed steel areas where the paint has been scratched and to prevent the rust from spreading? Is this even a valid concern?
dai is offline   Reply With Quote
Old 10-02-07, 07:08 PM   #2
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 29,117
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 179 Post(s)
Quote:
Originally Posted by dai View Post
Is there a product I can apply to prevent rust on exposed steel areas where the paint has been scratched and to prevent the rust from spreading?
There sure is. It's called "paint".

Seriously, there are commercial preparations that will remove the rust and treat the bare metal to inhibit further rusting. Naval Jelly is one brand but there are others. Then use touchup paint to cover the bare spots.
HillRider is offline   Reply With Quote
Old 10-02-07, 07:26 PM   #3
ScrubJ
Senior Member
 
Join Date: Apr 2006
Location: Vero Beach FL
Bikes:
Posts: 1,102
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Ospho on the rust, then touch up the paint
ScrubJ is offline   Reply With Quote
Old 10-02-07, 07:31 PM   #4
dai
Junior Member
Thread Starter
 
dai's Avatar
 
Join Date: Aug 2007
Bikes:
Posts: 18
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Would you guys actually worry about it? None of the rust spots are very large at present. Is it an impending problem, or would I do better to just leave it alone? Thanks for the quick responses!
dai is offline   Reply With Quote
Old 10-02-07, 07:51 PM   #5
Junkdad
Senior Member
 
Join Date: Jun 2006
Location: Austin, tx
Bikes: Beater Managerie
Posts: 267
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I've heard periodic application of linseed oil can inhibit the spread of rust. Anyone confirm / deny?
Junkdad is offline   Reply With Quote
Old 10-02-07, 08:06 PM   #6
knotty
Lost in Nostalgia
 
Join Date: Sep 2007
Location: Fog City
Bikes:
Posts: 651
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I just stripped a 70's steel frame because it had some rust spots showing through a few places. Upon removing the paint in the area of the rust, there were spider web like trails of rust running far away 6" to 10" from the original rust spot and running under what appeared to be good paint.

You have to chemically kill the rust (naval jelly, extend etc. ) so it doesn't continue to spread.

knotty
knotty is offline   Reply With Quote
Old 10-02-07, 09:18 PM   #7
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 29,117
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 179 Post(s)
Quote:
Originally Posted by dai View Post
Would you guys actually worry about it? None of the rust spots are very large at present. Is it an impending problem, or would I do better to just leave it alone? Thanks for the quick responses!
I certainly wouldn't ignore it. The spots you see are small but, as knotty said, rust can undercut the paint where you can't see it. It sounds like your bike was stored outside for quite a while so I'd definitely pursue this further. Consider stripping the frame completely, treating it and just giving it a rattle-can paint job unless it's worth a professional paint job to you.
HillRider is offline   Reply With Quote
Old 10-02-07, 09:22 PM   #8
BikingGrad80
that bike nut
 
BikingGrad80's Avatar
 
Join Date: Jul 2007
Location: Chicago north
Bikes: 2010 Motobecane Immortal Force 90' Trek 1400; 90' Trek 850; 06' Trek 520; 01 Iron Horse Victory
Posts: 934
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 22 Post(s)
Quote:
Originally Posted by Junkdad View Post
I've heard periodic application of linseed oil can inhibit the spread of rust. Anyone confirm / deny?
Pretty much anything that blocks water's access to the metal will prevent rust. The reaction requires water. It also need to be continually present ie not washed away.
BikingGrad80 is offline   Reply With Quote
Old 10-02-07, 09:34 PM   #9
arrasmithf
Senior Member
 
arrasmithf's Avatar
 
Join Date: May 2007
Bikes:
Posts: 76
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I used to do body work on cars as a hobby and found the best stuff ever in the world to combat rust and provide a nice surface to work with. The stuff is called POR-15. It's a thick black liquid that brushes directly on to rusted surface, neutralizes it, then chemicaly seals the area, further preventing rust, all the while leaving the area with a nice, smooth, semi-gloss surface to paint upon, or just leave as is. I have tried all the brush/spray/acids(naval jelly) rust converters and nothing comes close. The coolest thing is, no elbow grease. You spray on some degreaser(they have a recommended one of course, but i use simple green), then brush/roll it on bare rusty metal and come back the next day, and its damn near bulletproof. The magic of it is is that its a moisture cured coating, not a solvent based paint, so the more humidity in the air the better. If i sound like i am selling it, that's because I am, and today only at this special... Seriously, if i had the money, i would buy everyone this stuff for their stocking, becuase it works fantastic. drawbacks... the price is higher than most, and I can't ever find it locally, so you have to pay shipping on top of it. The good news is that for bikes, a pint/quart should last forever. Last one is a minor inconvenience. If it gets on your skin, make your peace with it cause it'll be there for a few weeks, That being said, this stuff, although industrial doesn't have hardly any of the nasties that come with solvent/acid stuff. I wouldn't drink it or bathe in it, but other than that, pretty harmless. I just revisited the site and looks like they have some new things that i can't wait to try, like a high gloss clear coat made out of the same stuff, and some different colors. I always just used black, and that even looks nice, Especially if its on beloved commuter/tourer/utility that you would hate to lose to cancer. Alright sorry about the book, but some things a person feels strongly about, and this is one of them for me. really, try it. they have a starter kit that you can buy, but 1 quart and you'll be sold... Thanks for listening, Frank


Damn, almost forgot... www.por15.com
arrasmithf is offline   Reply With Quote
Old 10-03-07, 05:34 PM   #10
Iowegian
Senior Member
 
Iowegian's Avatar
 
Join Date: Dec 2005
Location: Boulder, Colo
Bikes:
Posts: 1,862
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 28 Post(s)
You know...that sure sounds familiar...almost verbatim as a matter of fact.

That said, the stuff is supposed to work but is also supposed to be fairly toxic. For bikes I would use something a bit less 'industrial' but maybe that's just me.
Iowegian is offline   Reply With Quote
Old 10-04-07, 08:52 PM   #11
dai
Junior Member
Thread Starter
 
dai's Avatar
 
Join Date: Aug 2007
Bikes:
Posts: 18
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Frank - isn't the clear POR-15 basically just super glue (isocyanate)? Also - you don't remove the rust when you apply the POR-15, you just paint it over the de-greased top of the rusty area?

If that's the case, couldn't I just simple green the areas and super glue over the top of them? The areas are small - only a few millimeters in diameter. Thanks for the tip!
dai is offline   Reply With Quote
Old 10-04-07, 10:49 PM   #12
arrasmithf
Senior Member
 
arrasmithf's Avatar
 
Join Date: May 2007
Bikes:
Posts: 76
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
im not a chemical engineer, but there is a clear difference. The main one being that your digits wont get stuck together,and it doesnt ball up like super glue, it flows like paint, dries hard as hell, and you can sand/prime/paint on it.The MSDS is listed on the site so take a look, but this has fewer warnings than super glue. Now,for all i know you could have a shaman bless your ride with chicken blood and that may do a better job, but i gave my personal, average joe,rust-haters opinion. Until somebody else can chime in and back me up, then you just gotta take the red pill,Neo(or was it the blue one). Anyway, best of luck to you all, whatever method you choose.
arrasmithf is offline   Reply With Quote
Old 10-04-07, 11:27 PM   #13
BikeManDan
Senior Member
 
BikeManDan's Avatar
 
Join Date: Jul 2006
Location: Oakland, CA
Bikes:
Posts: 1,300
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Can't vouch for it personally but have heard of people using it on their prized steel frames: Weigle's Frame Saver
BikeManDan is offline   Reply With Quote
Old 10-05-07, 06:33 AM   #14
operator
cab horn
 
Join Date: Jun 2004
Location: Toronto
Bikes: 1987 Bianchi Campione
Posts: 28,306
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by dwoloz View Post
Can't vouch for it personally but have heard of people using it on their prized steel frames: Weigle's Frame Saver
I just have to ask - is frame saver really necessary? Good insurance? Piece of mind?
operator is offline   Reply With Quote
Old 10-05-07, 07:17 AM   #15
Grand Bois
Senior Member
 
Grand Bois's Avatar
 
Join Date: Mar 2005
Location: Pinole, CA, USA
Bikes:
Posts: 16,834
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 139 Post(s)
I used boiled linseed oil thinned with mineral spirits for better flow. I pour it into an empty lighter fluid container because the little spout allows me to get it into the tiny holes in the stays and fork.
Grand Bois is offline   Reply With Quote
Old 10-05-07, 11:57 AM   #16
pmt
Experienced
 
Join Date: Sep 2007
Bikes:
Posts: 1,021
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
POR-15 is certainly the thing to use on the rust. We use it on old British cars to save them all the time.
pmt is offline   Reply With Quote
Old 10-09-07, 06:53 PM   #17
dai
Junior Member
Thread Starter
 
dai's Avatar
 
Join Date: Aug 2007
Bikes:
Posts: 18
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks for all of the help - I ended up sanding down the offending areas and putting a few coats of rustoleum clear enamel, but I have some POR-15 on the way for a cruiser that I'm restoring that has a little more rust than my Fuji did.
dai is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 12:25 AM.