To powder coat or not

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Jim Becker
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Re: To powder coat or not

Postby Jim Becker » Sat May 16, 2020 12:21 pm

inairam wrote:
Jim Becker wrote:
radioguy41 wrote:Not a single powder coated item I have owned over the years has held up. . . .

Not properly applied, probably not held at temperature long enough to cure.


It is not a "cure" in the traditional sense. With powder coat, the oven time is melting the plastic on the surface.

For most powder, it has to establish crosslinking, which requires a specified time at a specified temperature after the melt/flow phase of the process. If the crosslinking hasn't happened, it will easily chip.

For example, look at page 2:
https://www.tiger-coatings.us/fileadmin ... _FINAL.pdf

inairam
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Re: To powder coat or not

Postby inairam » Sun May 17, 2020 7:32 am

Jim, what I meant by "it is not a tradition cure" is the material flows in the over before the heat causes the chemical reaction to form the long polymer chains which give power coat it toughness.

The oven time ( really part time/ temp) is just not for the chemical reaction of curing. The flowing of the coating is part of the painting process. Part time/temp is also giving the coating its surface finish, texture, and in most cases the final color. We spray smooth and textured finishes. The finishes are only seen after the oven cycle.

This is what makes is hard to cross-match the powder coating to paint color PMS charts. The heat cycle impacts other features besides cure. You can get a great durable coating out of an oven that is not the right shade or not the right texture due to the parts time/temp

In other words, the electrostatic powder coating takes less skill to spay but needs more skill in areas of process control ( oven time, exact oven temp, part mass and heat up time, good grounding, knowledge of the particulars of the exact coating you are using ...)
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Jim Becker
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Re: To powder coat or not

Postby Jim Becker » Sun May 17, 2020 12:31 pm

My point was that if the coating chips easily it was in all likelihood not properly cured, where the word "cure" is defined as used by the companies that make the powder.

Powder will flow at a time and temperature that will not accomplish the crosslinking. If somebody repeatedly puts out powder coatings that chip easily, he probably doesn't understand this. Time to find another coater. Although color and texture can be influenced by how the cure is done, lack of strength is a question of whether the cure time/temperature combination meets the minimum for the particular powder.

The powder companies call the process of holding temperature for a required time "curing". An old friend of mine often made the observation, "There is no point arguing over something that can be looked up." That is why I posted the link.

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Re: To powder coat or not

Postby JimCub48 » Sun May 17, 2020 8:19 pm

Over the years I have had several parts powder coated,from wheel weights to pulleys draw bars even lighter metals tool box even had bolts and pins done .All have held up extremely well.I have used the same company for years All pro powder coating.The color they use is a perfect ih color match.

halftonstude
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Re: To powder coat or not

Postby halftonstude » Tue May 19, 2020 6:59 pm

I also had gcr in south Windsor do mine they look great. Got my tires tubes and valve stems there as well. Great price and I got a tour of the blasting and coating area.
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Re: To powder coat or not

Postby Spencerpearson31 » Thu May 21, 2020 4:08 pm

So if you were to have all the tractor done what do you think a price would run . Just out of curiosity. I have a cub but mine would be in my small garden some and in shows . So a lot of red

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Shane N.
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Re: To powder coat or not

Postby Shane N. » Thu May 21, 2020 4:26 pm

Spencerpearson31 wrote:So if you were to have all the tractor done what do you think a price would run . Just out of curiosity. I have a cub but mine would be in my small garden some and in shows . So a lot of red

I doubt anyone would be able to afford it.
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Re: To powder coat or not

Postby Spencerpearson31 » Thu May 21, 2020 4:36 pm

Lol I would say the same . But would be neat to know. You would probably have to have 50lbs of red and a oven the size of the underworld to bake it in. Ha I could imagine the preheat on that job. But it would be cool

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Re: To powder coat or not

Postby JimCub48 » Thu May 21, 2020 5:37 pm

The tractor would have to be completely taken apart and reassembled as you can't place anything in the ovens that would melt gaskets ect. I would guess you would be in the $5000 plus range as there is a lot of prep work. Body shop type painting would be in that price range also . I have seen a few tractors done both ways definitely show trailer queens.

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Re: To powder coat or not

Postby Dusty B » Sat May 23, 2020 8:37 am

Peter Person wrote:I had my rear rims powder coated silver in May 2006 by R&B Powdercoat in Illinois. Came highly recommended by a forum member. They blasted the rims, soaked them with phosphoric acid, primed, and powdercoated them.
Had new Firestone Ag tires mounted at GCR Tire in South Windsor. They did a perfect job of mounting them, knew exactly what they were dealing with.
Image
Image

14 winters later with tire chains, they still look pretty darn good. There are a couple of small chips where the chains hit the bead and a few tiny rust spots showing at some of the lugs.

Have used R and B in Charleston Illinois for several sets of rims. All four done for 150 bucks can’t spend my time sanding priming and painting for that price!,
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Dusty B
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Re: To powder coat or not

Postby Dusty B » Mon May 25, 2020 7:32 pm

R & B in Charleston does all 4 rims for $150 - can’t spend my time steel brushing or sand blasting, priming & painting for that!! Have one set doing well after about 10 years!!
Grandpa's '41 B
'56,,'57,'59,'71 Cub
'51 Super C
'55 Case SC
Fairbanks-Morse 3KW Generator
Dad's DB garden tractor
'48 DeSoto
'31 "A Coupe
'51 Ford PU
'55 Dodge PU
God looks out for those of us who don't know how to look out for ourselves!


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