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Powder coating without baking



⇦ (tip: readers rarely show much interest in abstract questions, but people's actual situations usually prompt responses)   smiley face

Q. Where can I find a heated powder gun?

Jon Bragg
Work in a welding shop - Mount Juliet, Tennessee
October 25, 2021


A. Hi Jon. Please tell us what you do(the application) because such guns are available (see www.gts-ev.de/html_e/ts-info.htm#v_KUN, for example) but as far as I know the technology is far more complicated than traditional powder coating so the cost is probably out of range for hobbyists or occasional users. Good luck.

Luck & Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
October 2021



Q. I don't want to open a powder coat shop in near future, I am just very interested since I've been working with a friend who is a welder and he has a welding shop.

Jon Bragg [returning]
Work in a welding shop - Mount Juliet, Tennessee
October 27, 2021


A. Thanks Jon. There are applications for this, like when something large and permanently mounted can't be removed and put in an oven for curing. But your friend should realize that the usual, simpler, less costly approach is to make the parts electrostaticly attractive, spray the cold powder on then, then bake the parts to melt the powder and cure it.

Luck & Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
October 2021


thumbs up sign Thank you!

Jon bragg [returning]
- Mt juliet, tennessee
October 28, 2021


A. There's a gun available that sprays powder through a flame that's directed at the job. Its similar in some respects to flame sprayed metals such as aluminium or zinc. But these are expensive (as said by Ted above), and are quite tricky to use, and can give variable results. Generally less successful than oven cured.

geoff_crowley
Geoff Crowley
Crithwood Ltd.
supporting advertiser
Bathgate, Scotland, UK
crithwood logo
November 4, 2021




⇩ Closely related postings, oldest first ⇩



Q. I want to coat a bike frame, and I can't fit it into an oven, If I clear coat it, can I get away without baking it?

Wes Holland
hobbyist - Winchester, Massachusetts
October 12, 2008



simultaneous replies

A. Powder coat requires a bake, regardless of the color or material.
A clear coat can be a spray coat and SOME do not require a bake.

James Watts
- Navarre, Florida
October 14, 2008


A. Hi,
The simple answer is no -- powder curing depends upon heat (150-220 °C) to cross link its chemical constituents. If you had loads of cash you could install an Ultra Violet set up (no heat) --powder mfgr R&D now working on this and there is a working plant in the USA coating MDF.

Terry Hickling
Birmingham, United Kingdom
October 14, 2008


A. Hi. Although there are no powder coatings that do not require heat, there are certainly clear coats that don't ... from brass lacquer to polyurethane to epoxy to UV cured nail gel to automotive 2-component clearcoat.

Luck & Regards,

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey



A. There's a flame sprayed powder coating system available. It requires no oven.
Powder requires heat to "cross link" (cure), and this system provides the heat in a hand held flame gun a bit like metal spraying. The powder is heated while being propelled to the job from the gun.

geoff_crowley
Geoff Crowley
Crithwood Ltd.
Westfield, Scotland, UK
crithwood logo
October 16, 2008


A. Wes, there isn't anybody in the industry that would have tried this, so go for it and let us know. Sealing uncured powder under a catalyzed clear coat won't give you the cosmetic finish your looking for on a bike frame. The flame applicator won't either, correct me if I'm wrong Geoff, but I think it is only used for industrial type finishes and field application/repair type work, not highly cosmetic.

Sheldon Taylor
Sheldon Taylor
supply chain electronics
Wake Forest, North Carolina

October 24, 2008




Q. Dear Geoff,
If flame heated and propelled powder coating is possible and available, why it is not popular and not widely used?

Kumara subramaniam
- Chennai, India
December 24, 2008


Q. Hi I would like to know the answer to this Q also.
Regards, Ron

Ron Anderson
- Langley BC Canada
September 18, 2010


thumbs up sign  Hi, Kumera, hi Ron. Eastwood, for one, offers their "Hotcoat" system, fairly much as Geoff described.

I think the answer to why spraying of melted plastic is not the prevailing method comes from looking at it from the opposite direction, i.e., if I were to say: "I am finishing my parts by spraying them with a glop that requires that the parts be at the right temperature, and my gun must heat the glop to the right temperature, and I sometimes don't know whether it will flow correctly or go on too thin or too thick or lumpy; it sometimes burns & discolors; and the overspray lands and hardens on stuff, and is hard to remove and non-recyclable! ... Why doesn't someone invent a system where I just put a static charge on my parts, spray a fine powder on them, collecting any overspray for recycling, and then put the parts in an oven where I can easily control curing temperature and time?" :-)

Conventional powder coating is simply a versatile, proven, highly reliable application method with more general utility than the alternative that you're enquiring about :-)

Regards,

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
September 20, 2010

----
Update: I had been told, and had believed way back when, that the Eastwood "Hotcoat" system was one of these 'hot' sprays, but in checking into Eastwood systems, I see that they are 'conventional' powder coating, not a spray of melted plastic.

A. Since the powder just needs heat of around 350-400 for the allotted time, why not make an outdoor oven with coal/wood/whatever and stone/brick? Maybe slap it on a rack over fire or fire embers, might even give it a cool finish. Just a thought.

Dru Beaver
- Buffalo, New York USA
February 22, 2017




Baking powder coating in my kitchen oven

Q. Could I use just my gas oven in the kitchen for the coated items

Colette Brooks
Wrought iron manufacturing - Vanderbijlpark Gauteng South Africa
July 21, 2017



A. Hi cousin Colette. You can use that *type*, but don't even think about putting industrial parts into an oven that you cook food in. It's not that the oven won't work for that purpose, it's that you may eventually poison your family. If you don't draw the line at "food-only" in your kitchen oven, and instead perform a chem-industrial processes with your kitchen appliances, you'll soon talk yourself into doing others. It's the worst kind of slippery slope :-(

Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
July 2017




August 10, 2019
A 2009 Kawasaki KLR650 (not Richard's) 41658-2009_black_Kawasaki_KLR_650

Photo by Carsamar, Creative Commons, license detail

Q. Name is Richard, looking to coat my KLR650 with something that won't fade, chip, or just look like s*** in a week. A household-style oven could be used for smaller parts but, the frame. Could I use a hot air gun on lowest setting to bake the larger parts?

Richard Kennedy
- Citrus Heights, California


A. The answer to your question is you can cure powder with anything that will reach up to the temperature that the powder needs to cure. There's always a plan B; get a torpedo heater, hang up frame overnight, see what you've got in the morning. Make sure nothing flammable is in the way of the torpedo heater obviously.

Nathaniel J Stupak
- West Seneca New York
May 5, 2021


Please see also --
Topic 53452 "Oven-free "Flame" Powder Coating Systems"