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PostPosted: Wed Mar 14, 2012 9:29 pm 
Old School Hero
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Joined: Fri May 01, 2009 6:41 pm
Posts: 183
Location: The Netherlands
In my opinion the surface is too rough as a result of the paint removal by blasting with very sharp and hard media. When taking care and using the right blasting material the surface of the frame should be smooth as original.

You can see on the pictures that the welds also have a rough surface. Something that one would not expect after a careful job.

I can understand that the company uses certain blasting methods for cleaning large metal parts (e.g. constructions, I-beams, etc....) but a precious bike frame with low tubing thickness is another story.


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PostPosted: Wed Mar 14, 2012 10:17 pm 
Retro Guru
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Joined: Thu May 08, 2008 4:18 pm
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Quote:
low tubing thickness


It's a Cro-Mega ;)

Looks rougher than I'd expect, but the holes are almost certainly from corrosion from the inside. Blast off the paint and some flakes of rust and there's your hole.


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PostPosted: Wed Mar 14, 2012 10:20 pm 
Dirt Disciple
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Joined: Sun Aug 14, 2011 5:23 am
Posts: 64
Fill it with braize or weld it and grind it.It'll be ok.


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PostPosted: Wed Mar 14, 2012 10:40 pm 
Retro Guru
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I'll just leave this here: http://www.retrobike.co.uk/forum/viewtopic.php?t=191921


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PostPosted: Wed Mar 14, 2012 10:47 pm 
Retro Guru
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Joined: Tue Jul 05, 2011 8:24 pm
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Location: West Sussex
Yep, point taken. I have had a Kinesis steel frame blasted and powder coated before, without any problems, but I think in future when it comes to renovation of older frames I'll go for soda blasting.


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PostPosted: Wed Mar 14, 2012 11:02 pm 
Retro Guru
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I'm taking an interest as I've got a frame that I wouldn't mind having refinished one day :)

I reckon the Cro-Mega's saveable, it's not a highly-stressed bit of frame -- filling the hole as suggested above should work. My main concern would be getting a good paint finish if the tubes are as coarse as they look, but photos seem to exaggerate these things.


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PostPosted: Wed Mar 14, 2012 11:08 pm 
Retro Guru
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Location: West Sussex
Not in this case, they really are quite rough, it feels like coarse sandpaper.


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PostPosted: Wed Mar 14, 2012 11:20 pm 
Gold Trader / PoTM Winner / RB Rider
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Joined: Wed Oct 05, 2005 7:45 pm
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Location: kent
powder coating should be ok on that .


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PostPosted: Wed Mar 14, 2012 11:32 pm 
Old School Grand Master
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Location: Heathfield, East Sussex
I suspect, looking at your first pic again, that the seatpost issue as already mentioned was the main cause of the damage; it looks like the resulting damage was then hammered back into shape with a flat bladed screwdriver.

The coarseness of the finish would seem to indicate an automated grit blaster rather than a guy standing there with a hose/nozzle??

As the above reply says, powdercoating would conceal that okay, most likely without a primer...


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PostPosted: Thu Mar 15, 2012 2:57 am 
Retro Guru
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Joined: Sun Jan 15, 2012 8:24 pm
Posts: 456
Location: Toronto, Canada
Ouch! This thread is a heart breaker. I hope that frame can be saved.

My opinion is rust. The damage seems to far around the curve for the seatpost to have caused it.

To the op; I've seen worse damage repaired. Best of luck.


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