#11
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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. |
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#12
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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
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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
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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. |
#16
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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
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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
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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
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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
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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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