Powder coating - Page 2 - Ford Bronco Forum
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post #21 of 27 (permalink) Old 01-11-2017, 08:37 PM Thread Starter
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Originally Posted by Dman94X View Post
My opinion is that while it is a strong and durable finish, powder coat offers inferior protection once it has been penetrated. In my experience a chip or a scratch in powder coat will allow moisture to get between the coating and metal and spread fairly quickly compared to liquid coatings like the industrial paint mentioned above or POR15 type products.
I have been zinc plating my stuff then coating it. Time will tell how well it will work.
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post #22 of 27 (permalink) Old 01-12-2017, 03:49 PM
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Tell us about your zinc plating setup. I have been considering do some pieces.
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post #23 of 27 (permalink) Old 01-15-2017, 06:52 PM Thread Starter
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Tell us about your zinc plating setup. I have been considering do some pieces.
I bought a kit from Eastwood. There is a lot of info on the internet on how to do it. It is really pretty easy. I wouldn't waste the money on Eastwoods again.
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post #24 of 27 (permalink) Old 01-16-2017, 07:37 PM Thread Starter
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I don't know the details of your experience with powder coating, but I have been doing it professionally for the last 30 years and the only way it will peel off like that is if the part is not properly prepped or it was under baked. A chip won't result in such failure unless as noted above. Any exposed metal left unprotected will be a source for rust to creep underneath but it takes a very long time and moves very slowly if the surface was properly prepared and the part fully baked.

shustring, good luck with your set up. The best surface prep is a good sandblasting with FINE sand, silica or aluminum oxide... glass bead is ok but does not etch as well. If you use too coarse of a media the powder will not fully cover the metal and you might as well be coating over rust. One other important tip, the thicker the part the longer you will need to bake it. Depending on the powder you typically need 10 to 20 minutes at 350 to 400 degrees. That's peek metal temperature not how long the part is in the oven.

If you have any questions, feel free. Really looking forward to your results.
Allan
Hey Al, What about powder coating a chrome surface? I have a Harley that I thought I might do some powder coating on. Also what should I do for a good ground. Would a larger cable work?
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post #25 of 27 (permalink) Old 01-16-2017, 08:13 PM
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Hey Al, What about powder coating a chrome surface? I have a Harley that I thought I might do some powder coating on. Also what should I do for a good ground. Would a larger cable work?
You'll definitely have to knock the shine off of the chrome or the powder will not stick. At the very least a good scrubbing with a fresh scotch pad. You can also sand it with 150 grit or finer. A light sandblasting would be good but you have to be careful that the chrome does not start to peel.

I'm assuming your powder gun came with a wire and an alligator clip for grounding and that's all our Nordson portable requires though we are also grounded through conveyors and electrical conduit. I have never needed any extra grounding for coating over chrome plating.

I hope that answers your questions.
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post #26 of 27 (permalink) Old 01-22-2017, 02:22 PM Thread Starter
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You'll definitely have to knock the shine off of the chrome or the powder will not stick. At the very least a good scrubbing with a fresh scotch pad. You can also sand it with 150 grit or finer. A light sandblasting would be good but you have to be careful that the chrome does not start to peel.

I'm assuming your powder gun came with a wire and an alligator clip for grounding and that's all our Nordson portable requires though we are also grounded through conveyors and electrical conduit. I have never needed any extra grounding for coating over chrome plating.

I hope that answers your questions.
Thank you.
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post #27 of 27 (permalink) Old 01-22-2017, 03:29 PM Thread Starter
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