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Antique Tractor Paint and Bodywork

Painting Over Powder Coat

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stan2270

02-06-2007 07:31:30

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Firstly, just wanted to recognize all the fellas that post on this forum, the advice is outstanding and I have learnt so much just reading/lurking on this forum.

I know this is not a best practice! I have several parts back from the powder coater that are not the correct color and that I would like to repaint. I do not want to strip everything again. I am thinking I should Scotchbrite, then apply quality expoxy primer and topcoat. I do not think the powdercoat will let go for many many years, its hard as nails. Any advice appreciated! Thanks

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stan2270

02-06-2007 11:33:45

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Re: Painting Over Powder Coat in reply to stan2270, 02-06-2007 07:31:30

Here is another expert opinion I Googled, anyone have thoughts on this?

"Powder coatings are cured and baked at high temperature classified as thermal set coatings. The powder coating is urethane so any automotive grade coating will work very well. Clean the gas tank with a strong solvent or detergent to remove all petroleum residue. Sand or abrade the surface overall with 280 or 320 grit sand paper before the application of the liquid topcoat. The existing powder coat takes the place of a primer coat."

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DurangoCase

02-06-2007 10:50:27

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Re: Painting Over Powder Coat in reply to stan2270, 02-06-2007 07:31:30

You could start off with a coat of etching primer. I've painted glass and chrome with no let go.

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stan2270

02-06-2007 11:30:27

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Re: Painting Over Powder Coat in reply to DurangoCase, 02-06-2007 10:50:27

Thanks for the suggestion Durango. Is there any chance that the acid or eching agent in the self eching primer will weaken or react adversly with the powder coat? I assum the this type of primer is designed to etch bare metal to a point and then neutralizes once dry?

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DurangoCase

02-06-2007 13:39:22

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Re: Painting Over Powder Coat in reply to stan2270, 02-06-2007 11:30:27

I use VeraPrime. It will not lift powder coat. It's mad eto etch into bare metal or plastic bumpber, but sticks to anything it touches. Topcoat it with whatever you use. If anything lifts, it won't be the VeraPrime.

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CNKS

02-06-2007 13:10:59

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Re: Painting Over Powder Coat in reply to stan2270, 02-06-2007 11:30:27

I have not tried what you want to do, but I don't think I would put etch primer over anything but bare metal. Etch primer is nothing more than a substitute for sanding, its main use is in body shops to save time; it does little else. Whether it will react with the powder coat, I don't know, but it's not worth the risk. Also, if any of your powder coated parts are cast, etch primer is not recommended for cast because of the possiblility that it could be trapped in the pores and cause damage later. My preference would be to sand and give them a coat of epoxy first, which will stick to nearly any properly prepared surface, then topcoat within the recommended window.

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