Irony
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| posted on 5/1/11 at 03:36 PM |
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Powder Coating Plastic
Just plain daft or a possibility.......
I have been mulling the concept of trying to powder coat a plastic object. I have had good success with my electrostatic magic kit and I thought I
shall try a header tank. I have just bought of the bay a VW header tank for 10 whole pounds!! I normally cure the powder in the oven at about 120
degrees. Surely header tanks are made of thermosetting plastic and won't burn at this temp. I am not sure of the science behind creating the
negative charge so the powder sticks or if the cured powered will stick.
If it goes horribly wrong then I have lost a tenner!!
Any thoughts?
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Daddylonglegs
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| posted on 5/1/11 at 03:41 PM |
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quote:
Originally posted by Irony
....If it goes horribly wrong then I have lost a tenner!!
Any thoughts?
So go for it!  
It looks like the Midget is winning at the moment......
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blakep82
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| posted on 5/1/11 at 04:01 PM |
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hmm, weird as it might sound, isn't boiling water a different kind of heat to being in an oven? in the same way that humid heat is different to
dry heat?
i think it might melt in the oven, but as you say, only a tenner lost 
could maybe try a lower heat to start with?
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RickRick
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| posted on 5/1/11 at 04:04 PM |
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put it on something disposable in the oven, or it could be much more than just a tenner lost!
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Thinking about it
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| posted on 5/1/11 at 05:27 PM |
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I asked them about powder coating plastic when they were at the Stafford show. They said to get the ectrostatic charge , place a metal object in the
bottle and connect the earth wire to that. I thought they said 180 degrees was required but I may be wrong.
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plentywahalla
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| posted on 5/1/11 at 05:28 PM |
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You'll end up with a goooey blob.
Powder coatings are polyester or epoxy/polyester and need to reach melt temperature to flow out. usually around 180 to 200 degrees.
Most header tanks will be blow moulded High density polypropylene (HDPE) and will melt at a much lower temp, about 160 degrees.
Good luck ... you may need it.
[Edited on 5/1/11 by plentywahalla]
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nick205
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| posted on 5/1/11 at 05:30 PM |
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quote:
Originally posted by RickRick
put it on something disposable in the oven, or it could be much more than just a tenner lost!
My thoughts exactly!
Is it a styling thing to have the tank colour coded with the bodywork etc?
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Irony
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| posted on 6/1/11 at 12:04 PM |
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I have found that in my fan assisted beast of a oven 160-180 degrees is wayyyyyyyyy to much for the powdercoat. If you wack a metal object in there
at those temps for 15 it comes out looking like boiled crud. With experimentation the best finish I have acchieved is having 'my' oven at
100-120. Then wack the metal object in for a few minutes to get it up to temp. The more metal the more time this takes. Whip it out do your powder
coating and then back in the over for 5 minutes. Then turn the oven out and let cool for 15 minutes. Seems to work for me.
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