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  #11  
Old August 17th 17, 09:06 PM posted to rec.bicycles.tech
JBeattie
external usenet poster
 
Posts: 5,870
Default Powder Coating

On Thursday, August 17, 2017 at 10:50:48 AM UTC-7, Ian Field wrote:
"John B." wrote in message
...
On Wed, 16 Aug 2017 21:39:23 +0100, "Ian Field"
wrote:



"Joerg" wrote in message
...
On 2017-08-16 06:53, wrote:
The colors and consistencies you can get in powder coating is
fantastic. I found some slightly metallic very bright blue.

The problem is that powder coaters are not bicycle painters so the
rear dropouts that are chromed will be covered as well as everything
else.

So does anyone have an idea of how to remove the powder coating from
the dropouts without destroying the chrome at the same time?


AFAIK it's done the traditional way:

https://itstillruns.com/remove-paint...e-4809619.html

Paint is totally different to powder coat, AFAIK: traditional masking will
tend to rip off a strip of coating where you want it to stay.

Powder coating is most often done electrostatically - I vaguely remember
something about painting melted wax onto the chrome bits. The right kind
of
wax is an insulator that doesn't electrostatically hold the sprayed on
powder - or not so much anyway.

The end result still needs a bit of finishing round the edges - but you
shouldn't end up having to strip it back and start over.


I usually have bike frames powder coated in two or more colors and the
people that do it here are quite adept at masking. Whether to cover
chrome plating or just where two colors join. I'm told that they use a
"special masking tape" that will withstand the oven temperature.


Probably OK if you apply it thin enough, but that stuff has tensile
strength.


I wasn't going to say anything for fear of sounding like a weight-weenie, but powder paint is heavy. I had a frame painted, and the job was partly botched, so they put on a second coat. Crap man, two coats probably added a pound to the frame.

-- Jay Beattie.

Ads
  #12  
Old August 18th 17, 02:21 AM posted to rec.bicycles.tech
John B.[_3_]
external usenet poster
 
Posts: 5,697
Default Powder Coating

On Thu, 17 Aug 2017 18:50:43 +0100, "Ian Field"
wrote:



"John B." wrote in message
.. .
On Wed, 16 Aug 2017 21:39:23 +0100, "Ian Field"
wrote:



"Joerg" wrote in message
...
On 2017-08-16 06:53, wrote:
The colors and consistencies you can get in powder coating is
fantastic. I found some slightly metallic very bright blue.

The problem is that powder coaters are not bicycle painters so the
rear dropouts that are chromed will be covered as well as everything
else.

So does anyone have an idea of how to remove the powder coating from
the dropouts without destroying the chrome at the same time?


AFAIK it's done the traditional way:

https://itstillruns.com/remove-paint...e-4809619.html

Paint is totally different to powder coat, AFAIK: traditional masking will
tend to rip off a strip of coating where you want it to stay.

Powder coating is most often done electrostatically - I vaguely remember
something about painting melted wax onto the chrome bits. The right kind
of
wax is an insulator that doesn't electrostatically hold the sprayed on
powder - or not so much anyway.

The end result still needs a bit of finishing round the edges - but you
shouldn't end up having to strip it back and start over.


I usually have bike frames powder coated in two or more colors and the
people that do it here are quite adept at masking. Whether to cover
chrome plating or just where two colors join. I'm told that they use a
"special masking tape" that will withstand the oven temperature.


Probably OK if you apply it thin enough, but that stuff has tensile
strength.


I'm not sure what you mean here. "Tensile strength"?

What I specify, and what "my shop" does is to apply the lighter color
and bake, mask and apply the darker color and bake, apply a clear
coat, and bake. If you carefully rub your finger over the "joint"
between the two colors you cannot feel any difference. It is smooth.

I might add, that I make it a point to talk to people, get a little
friendly, ask about their kids, complement the ladies on their hair
style, etc. I even give the guys doing the actual work a "bit for
beer" and I always seem to get satisfactory service.
--
Cheers,

John B.

  #13  
Old August 18th 17, 02:32 AM posted to rec.bicycles.tech
John B.[_3_]
external usenet poster
 
Posts: 5,697
Default Powder Coating

On Thu, 17 Aug 2017 13:06:34 -0700 (PDT), jbeattie
wrote:

On Thursday, August 17, 2017 at 10:50:48 AM UTC-7, Ian Field wrote:
"John B." wrote in message
...
On Wed, 16 Aug 2017 21:39:23 +0100, "Ian Field"
wrote:



"Joerg" wrote in message
...
On 2017-08-16 06:53, wrote:
The colors and consistencies you can get in powder coating is
fantastic. I found some slightly metallic very bright blue.

The problem is that powder coaters are not bicycle painters so the
rear dropouts that are chromed will be covered as well as everything
else.

So does anyone have an idea of how to remove the powder coating from
the dropouts without destroying the chrome at the same time?


AFAIK it's done the traditional way:

https://itstillruns.com/remove-paint...e-4809619.html

Paint is totally different to powder coat, AFAIK: traditional masking will
tend to rip off a strip of coating where you want it to stay.

Powder coating is most often done electrostatically - I vaguely remember
something about painting melted wax onto the chrome bits. The right kind
of
wax is an insulator that doesn't electrostatically hold the sprayed on
powder - or not so much anyway.

The end result still needs a bit of finishing round the edges - but you
shouldn't end up having to strip it back and start over.

I usually have bike frames powder coated in two or more colors and the
people that do it here are quite adept at masking. Whether to cover
chrome plating or just where two colors join. I'm told that they use a
"special masking tape" that will withstand the oven temperature.


Probably OK if you apply it thin enough, but that stuff has tensile
strength.


I wasn't going to say anything for fear of sounding like a weight-weenie, but

powder paint is heavy. I had a frame painted, and the job was partly
botched, so they put on a second coat. Crap man, two coats probably
added a pound to the frame.

-- Jay Beattie.


I thought the same and weighed a frame before and after with an
electronic scale that weighs to 0.001 Kg. (about 0.04 Ounce) and there
was no difference in the scale reading :-)

--
Cheers,

John B.

  #14  
Old August 18th 17, 04:45 PM posted to rec.bicycles.tech
[email protected]
external usenet poster
 
Posts: 3,345
Default Powder Coating

On Thursday, August 17, 2017 at 7:26:37 AM UTC-7, Joerg wrote:
On 2017-08-16 13:39, Ian Field wrote:


"Joerg" wrote in message
...
On 2017-08-16 06:53, wrote:
The colors and consistencies you can get in powder coating is
fantastic. I found some slightly metallic very bright blue.

The problem is that powder coaters are not bicycle painters so the
rear dropouts that are chromed will be covered as well as everything
else.

So does anyone have an idea of how to remove the powder coating from
the dropouts without destroying the chrome at the same time?


AFAIK it's done the traditional way:

https://itstillruns.com/remove-paint...e-4809619.html


Paint is totally different to powder coat, AFAIK: traditional masking
will tend to rip off a strip of coating where you want it to stay.

Powder coating is most often done electrostatically - I vaguely remember
something about painting melted wax onto the chrome bits. The right kind
of wax is an insulator that doesn't electrostatically hold the sprayed
on powder - or not so much anyway.

The end result still needs a bit of finishing round the edges - but you
shouldn't end up having to strip it back and start over.



It's being done:

http://www.powdercoatguide.com/2013/08/masking.html

The edge line won't always be as sharp as with paint but on the near the
inside of the rear dropouts I guess it won't even be a cosmetic issue.


This is good information since I was worried about the rear wheel adjusters. The frame had a worn out bottom bracket so I left it installed to protect the threads.

The only thing I was concerned about was perhaps masking off the chrome rear dropouts but decided that it wouldn't matter because the powder coat is just as nice looking as the chrome would be.
  #15  
Old August 18th 17, 04:47 PM posted to rec.bicycles.tech
[email protected]
external usenet poster
 
Posts: 3,345
Default Powder Coating

On Thursday, August 17, 2017 at 7:32:44 AM UTC-7, Joerg wrote:
On 2017-08-16 09:20, wrote:
On Wednesday, August 16, 2017 at 7:15:01 AM UTC-7, Joerg wrote:
On 2017-08-16 06:53,
wrote:
The colors and consistencies you can get in powder coating is
fantastic. I found some slightly metallic very bright blue.

The problem is that powder coaters are not bicycle painters so
the rear dropouts that are chromed will be covered as well as
everything else.

So does anyone have an idea of how to remove the powder coating
from the dropouts without destroying the chrome at the same
time?


AFAIK it's done the traditional way:

https://itstillruns.com/remove-paint...e-4809619.html

For next time: Powder coat places are very much used to masking
areas but they have to be told which ones. With ultrasound machine
chassis we had them do that all the time because some panels had to
make electrical contact for safety, EMC, noise and other reasons.


That did give me the idea that I can't use my miniature wire brush on
the rotary tool.



Try not to ever do that on a bicycle.


... I don't know if lacquer thinner could work on powder
coat but I can certainly try.


Can't hurt to talk to a shop in your area that does powder coating. They
might be able to sell you a solvent or, if that comes in a bottle with
skull and bones on it, they might offer to do the job inhouse for a
reasonable fee.


I powder coated my wife's Mercian, spray painted on the contrasting
headtube color and then put on the decals. That bike road coast to
coast and there is only one small nick in the powder coat from laying
it in the station wagon on top of a wheel. Otherwise after 20 years
it looks almost new.


You should see my bikes. All scratched up and quite dirty. With the MTB
that is inevitable due to the frequent rock hits.

http://analogconsultants.com/ng/bike/Muddy3.JPG

The rear looks very different now, with a diagonal strut and a smaller
electronics box. But it's just as dirty.


The shop had to sandblast the old paint off so I imagine that messed up the chrome surface anyway.
  #16  
Old August 18th 17, 07:08 PM posted to rec.bicycles.tech
Ian Field
external usenet poster
 
Posts: 250
Default Powder Coating



"John B." wrote in message
...
On Thu, 17 Aug 2017 18:50:43 +0100, "Ian Field"
wrote:



"John B." wrote in message
. ..
On Wed, 16 Aug 2017 21:39:23 +0100, "Ian Field"
wrote:



"Joerg" wrote in message
...
On 2017-08-16 06:53, wrote:
The colors and consistencies you can get in powder coating is
fantastic. I found some slightly metallic very bright blue.

The problem is that powder coaters are not bicycle painters so the
rear dropouts that are chromed will be covered as well as everything
else.

So does anyone have an idea of how to remove the powder coating from
the dropouts without destroying the chrome at the same time?


AFAIK it's done the traditional way:

https://itstillruns.com/remove-paint...e-4809619.html

Paint is totally different to powder coat, AFAIK: traditional masking
will
tend to rip off a strip of coating where you want it to stay.

Powder coating is most often done electrostatically - I vaguely remember
something about painting melted wax onto the chrome bits. The right kind
of
wax is an insulator that doesn't electrostatically hold the sprayed on
powder - or not so much anyway.

The end result still needs a bit of finishing round the edges - but you
shouldn't end up having to strip it back and start over.

I usually have bike frames powder coated in two or more colors and the
people that do it here are quite adept at masking. Whether to cover
chrome plating or just where two colors join. I'm told that they use a
"special masking tape" that will withstand the oven temperature.


Probably OK if you apply it thin enough, but that stuff has tensile
strength.


I'm not sure what you mean here. "Tensile strength"?


You have to cut round what you want to peel off or it peels off a lot more
than you want.

  #17  
Old August 18th 17, 07:09 PM posted to rec.bicycles.tech
Ian Field
external usenet poster
 
Posts: 250
Default Powder Coating



wrote in message
...
On Thursday, August 17, 2017 at 7:26:37 AM UTC-7, Joerg wrote:
On 2017-08-16 13:39, Ian Field wrote:


"Joerg" wrote in message
...
On 2017-08-16 06:53, wrote:
The colors and consistencies you can get in powder coating is
fantastic. I found some slightly metallic very bright blue.

The problem is that powder coaters are not bicycle painters so the
rear dropouts that are chromed will be covered as well as everything
else.

So does anyone have an idea of how to remove the powder coating from
the dropouts without destroying the chrome at the same time?


AFAIK it's done the traditional way:

https://itstillruns.com/remove-paint...e-4809619.html

Paint is totally different to powder coat, AFAIK: traditional masking
will tend to rip off a strip of coating where you want it to stay.

Powder coating is most often done electrostatically - I vaguely
remember
something about painting melted wax onto the chrome bits. The right
kind
of wax is an insulator that doesn't electrostatically hold the sprayed
on powder - or not so much anyway.

The end result still needs a bit of finishing round the edges - but you
shouldn't end up having to strip it back and start over.



It's being done:

http://www.powdercoatguide.com/2013/08/masking.html

The edge line won't always be as sharp as with paint but on the near the
inside of the rear dropouts I guess it won't even be a cosmetic issue.


This is good information since I was worried about the rear wheel
adjusters. The frame had a worn out bottom bracket so I left it installed
to protect the threads.

The only thing I was concerned about was perhaps masking off the chrome
rear dropouts but decided that it wouldn't matter because the powder coat
is just as nice looking as the chrome would be.


The powder coat will crush when you tighten up - soon looks scruffy.

  #18  
Old August 18th 17, 08:46 PM posted to rec.bicycles.tech
Joerg[_2_]
external usenet poster
 
Posts: 6,016
Default Powder Coating

On 2017-08-18 08:47, wrote:
On Thursday, August 17, 2017 at 7:32:44 AM UTC-7, Joerg wrote:
On 2017-08-16 09:20,
wrote:
On Wednesday, August 16, 2017 at 7:15:01 AM UTC-7, Joerg wrote:
On 2017-08-16 06:53,
wrote:
The colors and consistencies you can get in powder coating
is fantastic. I found some slightly metallic very bright
blue.

The problem is that powder coaters are not bicycle painters
so the rear dropouts that are chromed will be covered as well
as everything else.

So does anyone have an idea of how to remove the powder
coating from the dropouts without destroying the chrome at
the same time?


AFAIK it's done the traditional way:

https://itstillruns.com/remove-paint...e-4809619.html

For next time: Powder coat places are very much used to
masking areas but they have to be told which ones. With
ultrasound machine chassis we had them do that all the time
because some panels had to make electrical contact for safety,
EMC, noise and other reasons.

That did give me the idea that I can't use my miniature wire
brush on the rotary tool.



Try not to ever do that on a bicycle.


... I don't know if lacquer thinner could work on powder coat but
I can certainly try.


Can't hurt to talk to a shop in your area that does powder coating.
They might be able to sell you a solvent or, if that comes in a
bottle with skull and bones on it, they might offer to do the job
inhouse for a reasonable fee.


I powder coated my wife's Mercian, spray painted on the
contrasting headtube color and then put on the decals. That bike
road coast to coast and there is only one small nick in the
powder coat from laying it in the station wagon on top of a
wheel. Otherwise after 20 years it looks almost new.


You should see my bikes. All scratched up and quite dirty. With the
MTB that is inevitable due to the frequent rock hits.

http://analogconsultants.com/ng/bike/Muddy3.JPG

The rear looks very different now, with a diagonal strut and a
smaller electronics box. But it's just as dirty.


The shop had to sandblast the old paint off so I imagine that messed
up the chrome surface anyway.


Yes, that may already have compromised the chrome plating. Hopefully not
to badly.

--
Regards, Joerg

http://www.analogconsultants.com/
  #19  
Old August 18th 17, 09:27 PM posted to rec.bicycles.tech
[email protected]
external usenet poster
 
Posts: 3,345
Default Powder Coating

On Friday, August 18, 2017 at 12:46:04 PM UTC-7, Joerg wrote:
On 2017-08-18 08:47, wrote:
On Thursday, August 17, 2017 at 7:32:44 AM UTC-7, Joerg wrote:
On 2017-08-16 09:20,
wrote:
On Wednesday, August 16, 2017 at 7:15:01 AM UTC-7, Joerg wrote:
On 2017-08-16 06:53,
wrote:
The colors and consistencies you can get in powder coating
is fantastic. I found some slightly metallic very bright
blue.

The problem is that powder coaters are not bicycle painters
so the rear dropouts that are chromed will be covered as well
as everything else.

So does anyone have an idea of how to remove the powder
coating from the dropouts without destroying the chrome at
the same time?


AFAIK it's done the traditional way:

https://itstillruns.com/remove-paint...e-4809619.html

For next time: Powder coat places are very much used to
masking areas but they have to be told which ones. With
ultrasound machine chassis we had them do that all the time
because some panels had to make electrical contact for safety,
EMC, noise and other reasons.

That did give me the idea that I can't use my miniature wire
brush on the rotary tool.


Try not to ever do that on a bicycle.


... I don't know if lacquer thinner could work on powder coat but
I can certainly try.


Can't hurt to talk to a shop in your area that does powder coating.
They might be able to sell you a solvent or, if that comes in a
bottle with skull and bones on it, they might offer to do the job
inhouse for a reasonable fee.


I powder coated my wife's Mercian, spray painted on the
contrasting headtube color and then put on the decals. That bike
road coast to coast and there is only one small nick in the
powder coat from laying it in the station wagon on top of a
wheel. Otherwise after 20 years it looks almost new.


You should see my bikes. All scratched up and quite dirty. With the
MTB that is inevitable due to the frequent rock hits.

http://analogconsultants.com/ng/bike/Muddy3.JPG

The rear looks very different now, with a diagonal strut and a
smaller electronics box. But it's just as dirty.


The shop had to sandblast the old paint off so I imagine that messed
up the chrome surface anyway.


Yes, that may already have compromised the chrome plating. Hopefully not
to badly.


I just called and I don't think they received the custom color yet and so haven't started. I asked them to mask off the dropouts.
  #20  
Old August 18th 17, 09:27 PM posted to rec.bicycles.tech
Ian Field
external usenet poster
 
Posts: 250
Default Powder Coating



"Joerg" wrote in message
...
On 2017-08-18 08:47, wrote:
On Thursday, August 17, 2017 at 7:32:44 AM UTC-7, Joerg wrote:
On 2017-08-16 09:20,
wrote:
On Wednesday, August 16, 2017 at 7:15:01 AM UTC-7, Joerg wrote:
On 2017-08-16 06:53,
wrote:
The colors and consistencies you can get in powder coating
is fantastic. I found some slightly metallic very bright
blue.

The problem is that powder coaters are not bicycle painters
so the rear dropouts that are chromed will be covered as well
as everything else.

So does anyone have an idea of how to remove the powder
coating from the dropouts without destroying the chrome at
the same time?


AFAIK it's done the traditional way:

https://itstillruns.com/remove-paint...e-4809619.html

For next time: Powder coat places are very much used to
masking areas but they have to be told which ones. With
ultrasound machine chassis we had them do that all the time
because some panels had to make electrical contact for safety,
EMC, noise and other reasons.

That did give me the idea that I can't use my miniature wire
brush on the rotary tool.


Try not to ever do that on a bicycle.


... I don't know if lacquer thinner could work on powder coat but
I can certainly try.


Can't hurt to talk to a shop in your area that does powder coating.
They might be able to sell you a solvent or, if that comes in a
bottle with skull and bones on it, they might offer to do the job
inhouse for a reasonable fee.


I powder coated my wife's Mercian, spray painted on the
contrasting headtube color and then put on the decals. That bike
road coast to coast and there is only one small nick in the
powder coat from laying it in the station wagon on top of a
wheel. Otherwise after 20 years it looks almost new.


You should see my bikes. All scratched up and quite dirty. With the
MTB that is inevitable due to the frequent rock hits.

http://analogconsultants.com/ng/bike/Muddy3.JPG

The rear looks very different now, with a diagonal strut and a
smaller electronics box. But it's just as dirty.


The shop had to sandblast the old paint off so I imagine that messed
up the chrome surface anyway.


Yes, that may already have compromised the chrome plating. Hopefully not
to badly.


there's also various kinds of shot peening, sometimes with plastic beads.
there may be a formulation that shifts paint without damaging chrome.

 




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