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Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Problems in powder Coating on Wood
Q. I have tried to use powder coating on wood, but the surface after coating is not smooth. I want to know what is my mistake?
1- temperature: 180-200 °C
2- speed: 75 cm/minute
3- gun: manufactured by OMEGA CO.
4- material: epoxy
Hosein Abbaspour- Tehran, Iran
A. Hi Hosein,
Firstly you will need to explain "not smooth" it could be a number of surface defects. Powder coating on to natural wood has not been fully developed yet, so there is no real answer to your question. However using a powder coating that cures at 180-200 °C is definitely not the answer. At this temperature the wood will start to Char, not only this but the moisture that is contained in natural wood will try to evaporate through the powder film causing bubbles or craters to appear in the final film. If you want to have any degree of success you will have to use a low temperature cure powder coating - UV or IR cured. Contact your powder supplier for more details.
Good Luck,
Drew Devlin- North Lincolnshire, England, U.K.
A. Drew Devlin is right. There are a few ways to powder coat wood. One is to use a wood primer, which assists in the conductivity. The liquid is applied by conventional spray and is purely for the conductivity only. The second is to use low cure coatings or UV curing. UV curing would not work if the powder does not have a photoinitiator. This low cure is the best option. [There are] coatings that cure from 100 °C. At this temperature the substrate can perform without charring.
Regards,
Ramoo Puru- Singapore
A. You must cure before applying paint on the wood because the natural wood contains water and you must cure the wood with IR or UV oven to eliminate the humidity.
Q. But I would like to know what are the colors that we can apply in then wood in powder coating.
Ben Farah Mohamed Taher- Tunisia
April 26, 2009
A. Hi Hosein
Thermal curable powder coating(180-200 °C) is not suitable for wood coating.You must use UV curable powder coating or low temperature curable powder coatings.
Institute for Color Science and Technology - Tehran, Iran
November 15, 2009
Q. Interested to do Powder coating on Wooden Articles., Let us know how the process is done, the machines required and the applications, etc. Complete project with technical know-how.
What will be the benefit and special features. Its durability and long run market. Major market - where it is?
Currently if any project has been set up in India ?
- Gujart, India
December 16, 2012
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