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    Re: DIY Powder Coating
    #11
    Millenium Member Deranged's Avatar
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    I think some of the newer powders have an over bake protection in them.
    Nowhere near the desert.
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    Re: DIY Powder Coating
    #12
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    Quote Originally Posted by Deranged View Post
    I think some of the newer powders have an over bake protection in them.
    They do, but only up to twice the recommended bake time. So if a powder has a cure time of 15 min @ 400*, which most do, you can safely bake them for up to 30 min (once the part reaches 400*).
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    Re: DIY Powder Coating
    #13
    Senior Member N8ball's Avatar
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    One thing to add about the HF p- coat gun, unplug it when you service the nozzle. That thing is pushing 30kV and I know first hand what it feels like to be the ground. It's a very energizing experience. Also, it will never lay powder down like a production model gun will. Some one else mentioned that so I'll leave it at that.

    To the guy talking about the big oven- circulating air in the oven is easy. the hard part is keeping powder on the part. Any moderate air speed will blow the powder off. A false ceiling used as a plenum with an array of holes around the perimeter works to maximize air flow, and minmize air speed. both of which are important. in addition to the fans you need high temp insulation. You also want to use a high temperature Caulk like aluminum silicon to seal all the seams. I assembled a 8x16x8 gas fired PowderX oven 3 years ago and we used 6" of rock wool for the insulation. That oven has been used 5 days a week since. Keeping it the right temp is a science in itself. It has a great controller but if you don't get it calibrated regularly you can get way off on your temps.

    One last thing on cure temps. The listed cure times for any specific powder are in terms of metal temp. 400' for 15 minutes means the metal needs to get to 400' for 15 minutes. It does not mean in a 400' oven for 15 minutes. I have powder coated alloy wheels that took over an hour to get to temp. That was using low temp cure powder at around 300'. 20 gauge sheet metal on the other hand heats up in just a couple minutes. A digital infrared thermometer is your friend when learning to p-coat.
    Last edited by N8ball; 11-02-2012 at 06:44 AM.
    Life moves pretty fast. If you don't stop and look around once in a while, you could miss it.- Ferris Bueler
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    Re: DIY Powder Coating
    #14
    Senior Member N8ball's Avatar
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    Tip from the pro-

    Powder can have trouble getting into tight areas like corners. This is due to the overlapping electrical forces actually repelling the powder from the part. In most cases, moving the gun closer will just blow the powder away more. If you are having trouble getting an even coat on irregular surfaces or in corners, try hot flocking the part. Heat it up in the oven, then shoot it hot. The powder will gel almost instantly. It is easy to build up a thick coat in one shot but don't make it too thick because the powder will run.
    Life moves pretty fast. If you don't stop and look around once in a while, you could miss it.- Ferris Bueler
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    Re: DIY Powder Coating
    #15
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    There is also a liqui-powdr base. That you can mix with power coat and spray with a air brush. From Tech-Line. It gets in to the tight areas.
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