Powder Coating

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?

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.

--
Regards, Joerg

http://www.analogconsultants.com/

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

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.

"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.

On Wednesday, August 16, 2017 at 9:53:48 AM UTC-4, 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?

Get whomever does the powder coating to mask off the chromed areas you don't want the powder coat to go onto.

Cheers

On Wed, 16 Aug 2017 06:53:45 -0700 (PDT), 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?

I read that "Dichloromethane (Methylene chloride... ie Klean-Strip
Aircraft stripper or Permatex Gasket Remover)" will remove powder
coating" and my own experience has been that MEK (methyl ethyl ketone)
will soften it. There are also a number of commercial products
designed to remove powder coating.
--
Cheers,

John B.

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.
--
Cheers,

John B.

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.

--
Regards, Joerg

http://www.analogconsultants.com/

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.

--
Regards, Joerg

http://www.analogconsultants.com/

"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.