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Old 3rd October 2006, 04:37 AM   #1
jarthel is offline jarthel  Australia
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Default powder coating VS painting?

does anyone know which produces a better looking and more durable finish?

color will be matt black (not sure if powder coating comes in matt black as I haven't used such a service before).
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Old 3rd October 2006, 05:14 AM   #2
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I guess that would all depend on your application.

Powder coating is generally more durable than paint, but has a tendency to "chip" if something hits it or if its on a soft metal such as aluminum. Also, when the powder coating is being applied, it tends to have a hard time covering sharp edges like you would find on a heatsink.

I have seen matte black powder coat, so I know its available.
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Old 3rd October 2006, 05:15 AM   #3
poobah is offline poobah  United States
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Much depends on the substrate and its coatings and platings. In the early days it was assumed that surface preparation and plating were less important... history has proven otherwise. One key problem is that the film itself is stronger than its bond to some metals. The result is that lacking proper platings etc... corrosion can spread like wildfire under the film.

What are you looking to cover?

Matte black is certainly available.

All in all powder coating is pretty tough stuff... especially the epoxy stuff. The ultimate in finish quality, appearence, remains paint.
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Old 3rd October 2006, 06:09 AM   #4
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Quote:
Originally posted by poobah
All in all powder coating is pretty tough stuff... especially the epoxy stuff.
I'm just about to have a powdercoated aluminium slate rooftop.
Supposed to be the best solution for living this close to the waterfront.
Highly durable, 50 years guaranteed, but don't throw bricks on it.

Paint can be polished, think pianos and cars, powdercoating not.
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Old 7th October 2006, 12:16 PM   #5
jarthel is offline jarthel  Australia
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hifi devices (commercially built ones) looks like they are powder coated. true?
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Old 7th October 2006, 05:49 PM   #6
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Quote:
Originally posted by poobah
All in all powder coating is pretty tough stuff... especially the epoxy stuff. The ultimate in finish quality, appearence, remains paint.
In terms of gloss index you are right, at least for now. In terms of durability, cleanability, scuff resistance powder coating is in an entirely different electron orbit of superiority.
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Old 7th October 2006, 06:01 PM   #7
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Quote:
Originally posted by poobah
All in all powder coating is pretty tough stuff... especially the epoxy stuff. The ultimate in finish quality, appearence, remains paint.
TGIC powders are some of the best these days. Epoxy is not good for outdoors use as its UV unstable and you can't get a good gloss. You can actually polish powdercoat.

You can get VERY high gloss TGIC powders but they show up any flaws in the substrate and if you overbake them (as I usually do ) they go dull.

For a matt or satin finish I'd go for powdercoat any day. If you get problems with sharp edges it means they're using too many volts on the gun.
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Old 7th October 2006, 06:41 PM   #8
poobah is offline poobah  United States
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Jarthel,

Many manufacturers, myself included, are opting for power coated parts. When done right, it is hard to tell one from other.

The reasons behind all this are many:

1) Powder coating allows for unskilled operators in the application, the film thickness is controlled by the process and not the operator.

2) Powder coating does not release volatile solvent solvents in the air... cuts down on pollution, and the expense of the solvents in the first place.

3) Powder coating allows for the use of materials that did not lend themselves well to solvent sprayed processes.

4) The process is completely cost competive, if not cheaper, than solvent sprayed painting. With the right equipment, the process can be virtually waste free.

All in all, it is a good environmental and economic thing. I'll bet it won't be too long before we see automobiles powder coated.

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Old 7th October 2006, 06:45 PM   #9
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Powder coating easily chips off when the surface is not prepared well.

I have had my amp cases powder coated as well as painted. It depends on your taste. Here in India, we have another kind of paint known as 'vapocure' by a brand called MRF. It is sprayed and leaves a lacquer finish.

A good finish can be obtained by lacquering a painted and rubbed surface.

While everybodys at it, I have a question. Any idea how to get a scratch resistance epoxy coat done on Ply or MDF? I've seen this kind of textured tough finish on some EV and JBL speaker cabs. Ofcourse, PA is a different ball game but I need to get my touring stuff done up that way. Thanks.
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Old 7th October 2006, 06:53 PM   #10
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One thing that can catch out powdercoating is that you have to bake it. A friend had his amp case powdercoated and it warped.

Samuel, the finish you are on about has been described on here before. I think it was in a thread I started about truck bed liner in the UK as I was looking for the same thing you are, and I thought it was what our American friends on here keep referring to as truck bed liner.

edit: found thread Truck Bed Liner (UK)
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