Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Paint cracked & peeling on frame's front derailleur braze-on surface

Search
Notices
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.

Paint cracked & peeling on frame's front derailleur braze-on surface

Thread Tools
 
Search this Thread
 
Old 01-25-13, 05:37 PM
  #1  
Senior Member
Thread Starter
 
Join Date: Sep 2009
Posts: 936
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Paint cracked & peeling on frame's front derailleur braze-on surface

I noticed the paint at the very end of the braze-on mating surface (on the frame) was cracking. If I use my fingernail, I could probably peel up about half the size of a penny (I'm not going to touch it).

Do you think this indicates a wider paint problem, with the painting process, on my entire frame?

Last edited by lineinthewater; 04-15-13 at 01:45 PM.
lineinthewater is offline  
Old 01-25-13, 05:52 PM
  #2  
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 38,725

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Mentioned: 140 Post(s)
Tagged: 1 Thread(s)
Quoted: 5791 Post(s)
Liked 2,581 Times in 1,431 Posts
Thismis par for the course and very common. The braze-on flexes when the FD is tightened and the paint is too brittle and so cracks or flakes. Usually nobody notices since the affected area is usually hidden, but sometimes (more rarely) the paint will also chip, crack or flake on the more visible front surface.

Touch it up and move on.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

Just because I'm tired of arguing, doesn't mean you're right.

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline  
Old 01-25-13, 06:16 PM
  #3  
Senior Member
Thread Starter
 
Join Date: Sep 2009
Posts: 936
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by FBinNY
Thismis par for the course and very common. The braze-on flexes when the FD is tightened and the paint is too brittle and so cracks or flakes. Usually nobody notices since the affected area is usually hidden, but sometimes (more rarely) the paint will also chip, crack or flake on the more visible front surface.

Touch it up and move on.
Thanks for the feedback. I didn't know this was a common occurrence.

I can't really just touch it up with a dab of paint. The existing paint has cracked and lifted. It seems the only thing to do is peel off the loose paint, until it has a clean (not lifting) edge. Then, sand lightly and apply paint.

My main concern is preventing the peeling from spreading to the main frame body (assuming it would go that far).
lineinthewater is offline  
Old 01-25-13, 06:31 PM
  #4  
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 38,725

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Mentioned: 140 Post(s)
Tagged: 1 Thread(s)
Quoted: 5791 Post(s)
Liked 2,581 Times in 1,431 Posts
Originally Posted by lineinthewater
Thanks for the feedback. I didn't know this was a common occurrence.

I can't really just touch it up with a dab of paint. The existing paint has cracked and lifted. It seems the only thing to do is peel off the loose paint, until it has a clean (not lifting) edge. Then, sand lightly and apply paint.

My main concern is preventing the peeling from spreading to the main frame body (assuming it would go that far).
Generally this doesn't extend far, and I've never seen it move from the FD mount to the frame. Allow yourself a bit of room and use the edge of a file, or sand paper wrapped over a knife to cut a line as a stop, and peel the paint up to there. If it does extend far or off the mount to the frame, I'd say it means the frame wasn't washed or primed properly before painting, so it could be a warranty issue.

I've seen people rebond paint by wicking a drop of superglue under it, and pressing. (don't glue your finger) This doesn't work with all paints, but seems OK with many powder coats, which are the paints most prone to this kind of chipping.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

Just because I'm tired of arguing, doesn't mean you're right.

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline  
Old 01-25-13, 06:41 PM
  #5  
Senior Member
Thread Starter
 
Join Date: Sep 2009
Posts: 936
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by FBinNY
Generally this doesn't extend far, and I've never seen it move from the FD mount to the frame. Allow yourself a bit of room and use the edge of a file, or sand paper wrapped over a knife to cut a line as a stop, and peel the paint up to there. If it does extend far or off the mount to the frame, I'd say it means the frame wasn't washed or primed properly before painting, so it could be a warranty issue.
I have a car that suffered from the same problem, so I'm paranoid of factory painting problems. I'm praying it is not a factory prep issue.

Originally Posted by FBinNY
I've seen people rebond paint by wicking a drop of superglue under it, and pressing. (don't glue your finger) This doesn't work with all paints, but seems OK with many powder coats, which are the paints most prone to this kind of chipping.
I like the glue idea. I'm not a big fan of superglue. It seems epoxy (i.e. 5-minute) would be more effective. No experience to back it up, just thinking out loud.

Since it's this year's model, I can probably easily pick up some Cannondale touch-up paint .... maybe Cannondale will send me some.
lineinthewater is offline  
Old 01-25-13, 06:45 PM
  #6  
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 38,725

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Mentioned: 140 Post(s)
Tagged: 1 Thread(s)
Quoted: 5791 Post(s)
Liked 2,581 Times in 1,431 Posts
Originally Posted by lineinthewater
I have a car that suffered from the same problem, so I'm paranoid of factory painting problems. I'm praying it is not a factory prep issue.



I like the glue idea. I'm not a big fan of superglue. It seems epoxy (i.e. 5-minute) would be more effective. No experience to back it up, just thinking out loud.

Since it's this year's model, I can probably easily pick up some Cannondale touch-up paint .... maybe Cannondale will send me some.
Since it's a new bike, bring it bck to the bike shop and let them touch it up. Let them know that you're not trying to make a big thing about it if it stays local, but want it documented in case it's part of a pattern, and there's more chipping later. Also take a few photo's and save them. All in all, you're probably OK, but this will give you some measure of protection.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

Just because I'm tired of arguing, doesn't mean you're right.

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline  
Old 01-25-13, 06:48 PM
  #7  
Senior Member
Thread Starter
 
Join Date: Sep 2009
Posts: 936
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by FBinNY
Since it's a new bike, bring it bck to the bike shop and let them touch it up. Let them know that you're not trying to make a big thing about it if it stays local, but want it documented in case it's part of a pattern, and there's more chipping later. Also take a few photo's and save them. All in all, you're probably OK, but this will give you some measure of protection.
Very prudent. Thank you for the suggestion. I wasn't planning on doing anything until I showed it to the shop.
lineinthewater is offline  
Old 01-25-13, 07:17 PM
  #8  
S'Cruzer
 
pierce's Avatar
 
Join Date: Jun 2010
Location: 122W 37N
Posts: 2,445

Bikes: too many

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 41 Post(s)
Liked 19 Times in 17 Posts
I'd probably use a xacto knife to cut the chip at the limit of the peel, that way more doesn't peel up when you lift the chip.
pierce is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
WizardOfBoz
Bicycle Mechanics
15
01-24-17 06:58 PM
mrkano
General Cycling Discussion
3
06-01-14 05:16 AM
Cyclist1092309
Bicycle Mechanics
5
12-02-13 09:20 AM
Lewis_Moon
Classic & Vintage
13
10-02-12 09:10 PM
DirtyHarry714
Classic & Vintage
43
02-09-12 11:17 AM

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.