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-   -   Powder or Liquid Paint (http://www.diychatroom.com/f2/powder-liquid-paint-35193/)

Nestor_Kelebay 01-05-2009 10:34 PM

Quote:

Originally Posted by Payperbiz (Post 207667)
Painting is one of my pastimes. Changing the color of my room every two months is typical of me already. Sometimes though, I opt to hire the services of LINK REMOVED since they perform excellent painting jobs. However, I was told by a friend that liquid paint is a thing of the past and powder paint is more effective. Is there any truth to this or would I be spending more if I shifted to powder coated paint?
LINK REMOVED

Not sure what to say because I don't know that I'm understanding your question. And that's mostly because I'm not sure that you understand what you mean by "powder coated paint". I presume you're talking about powder coatings.

With a powder coating, a mixture of very hard plastic resins(typically a polyester of some sort) and coloured pigments is electrostatically sprayed onto a piece of METAL to be coated. It's essential that the piece to be coated be metal so that it can be charged to attract the oppositely charged resins and pigments electrostatically, and that the thickness of the powder coat be fairly uniform. That piece of powder coated metal is then heated in an oven at anything from 350 to 1300 degrees F for anything from two to four hours. During the baking process, the polyester resins melt and flow together to form a smooth film of molten plastic that's both bonded to the metal and encases the coloured pigments very much like the raisins in raisin bread. As the coated piece cools, the plastic returns to it's original hardness and the resulting "powder coating" will typically be about three times as hard and durable as an air dry coating like polyurethane hardwood floor finish (which in turn is much harder than a latex wall paint).

The cook top on your stove will be powder coated, as will your steel enamel bath tub and maybe the porcelain enamel sink in your kitchen. There is a powder coating on the inside of your water heater's tank to protect it from corrosion and also keep the water free of rust. The hardest powder coating in a typical house is the blue-grey "ceramic coating" in the oven. Ceramic coatings are a class of powder coating that are baked on at temperatures above 1000 deg. F. and are normally much harder and more durable than powder coatings baked on at lower temperatures like 350 deg. F.

Your friend is right that powder coatings are superior to alkyd or latex house paints in many respects, but powder coatings simply can't be used for anything other than relatively small metal objects. They could never be used as a replacement for house paints. Also, because the powder is electrostatically sprayed on, you need bare metal to strongly electrostatically attract the mixture of charged plastic particles and coloured pigments. So, you need to sand blast off any previous coating on the metal before applying a new powder coating. You can't just bake a new coating over top of whatever is there like you can paint over old paint.

Tell your friend that the difference between paint and powder coatings is much the same as the difference between a fish and a bicycle. There's more differences etween them than there are similarities, and so you can't use one in place of the other.

Powder coatings are also known by the name "porcelain enamel":

http://www.porcelainenamel.com

Termite 01-05-2009 10:49 PM

I have a strong hunch that this is a spam post. If not, perhaps payperbiz will ask the question more clearly. This one's on a short leash...

AtlanticWBConst. 01-06-2009 06:05 AM

FWIW, Looks like a spam post to me too.

Also: Look at the Poster's name.


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