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Chassis painting?
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AREX
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PostPosted: Mon Dec 28, 2020 8:33 am    Post subject: Chassis painting? Reply with quote

Hi,

My KG chassis is sandblasted with new floor panes welded on and all small necessary repairs.

My shop recommends a primer and then a powder coating (gloss black).

Do you think this is a good solution? Or maybe a primer and a paint with a hardener will be better as theoretically more flexible?

I don't want to be smarter than a shop specialist, but it's always worth asking...

A friend told me to first galvanize (zinc) the chassis and then paint it ... I know in theory it sounds good, but such a large galvanizing bath is far from me and you would have to transport the chassis on a trailer ...
the second concern is whether it will bend during galvanization?
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infiniteLoop
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PostPosted: Mon Dec 28, 2020 7:14 pm    Post subject: Re: Chassis painting? Reply with quote

I thought powder coating had to be heated in an oven. I don't see how powder coating or hot dip galvanization could be practical.

If you have a rust free surface, a product like Rustbullet / MasterSeries and so on ,should be an excellent surface to put a real oil based under coating on. If you store the car in a dry environment ,it should out last you. Very Happy
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Braukuche
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PostPosted: Fri Jan 01, 2021 10:02 am    Post subject: Re: Chassis painting? Reply with quote

People powder coat pans all the time. It will be more durable than paint, but more expensive. Itís also not going to look stock, if thatís a consideration.
Iíd stay away from the brush on stuff. If you chose paint do it right and use real two part paint.
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infiniteLoop
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PostPosted: Fri Jan 01, 2021 2:30 pm    Post subject: Re: Chassis painting? Reply with quote

Is the entire pan being powder coated? I think it would be cumbersome to try to weld in a powder coated pan. Confused
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AREX
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PostPosted: Tue Jan 12, 2021 10:39 am    Post subject: Re: Chassis painting? Reply with quote

It will be powder coated after welding process, and yes entire floor (chasiss) will be painted this way.
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Mike Fisher
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PostPosted: Wed Jan 13, 2021 11:10 am    Post subject: Re: Chassis painting? Reply with quote

I would brush/spray www.masterseriesct.com in silver & black on the pan/chassis/inner fenders/suspension.
The satin silver first & then the glossy black comes out real nice & easy to touch up it gets damaged! Cool
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viiking
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PostPosted: Wed Jan 13, 2021 3:12 pm    Post subject: Re: Chassis painting? Reply with quote

Why primer? I thought powder coat was applied to bare sandblasted metal. Am I wrong here?

To do it properly you would need to blast the chassis a second time before powder coating otherwise flash rust will remain under the powder coat.

The only other thing I am concerned with in powder coating is what sort of roads are you driving on. I've seen photos of powder coated parts which have had rock chips exposed the metal only for the powder coat to rust underneath and then the powder coat falls off in flakes.

I too think that painting with either a two pack paint or a moisture cured polyurethane paint is the way to go and much easier to repair if it gets chipped.
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viiking
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PostPosted: Wed Jan 13, 2021 3:16 pm    Post subject: Re: Chassis painting? Reply with quote

Why primer? I thought powder coat was applied to bare sandblasted metal. Am I wrong here?

To do it properly you would need to blast the chassis a second time before powder coating otherwise flash rust will remain under the powder coat.

The only other thing I am concerned with in powder coating is what sort of roads are you driving on. I've seen photos of powder coated parts which have had rock chips exposed the metal only for the powder coat to rust underneath and then the powder coat falls off in flakes.

I too think that painting with either a two pack paint or a moisture cured polyurethane paint is the way to go and much easier to repair if it gets chipped.
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esde
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PostPosted: Wed Jan 13, 2021 4:25 pm    Post subject: Re: Chassis painting? Reply with quote

I hate powder coat for any frame or chassis, especially with old metal. Too much experience with chipping or flaking, and it never gets into the seams like a good paint can. If it's a driver, give it a heavy coat of epoxy primer, then carefully seam seal any voids, and recoat with epoxy. The epoxy is super tough, and I have never had it chip. The only thing that kills epoxy is UV, but under the car it's not an issue.
Galvanizing would be cool, if you didn't care about adding an extra hundred pounds or so. It adds up fast, especially on hollow forms.
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