Should I put undercoat on over bare metal? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-21-2019, 03:13 PM
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Should I put undercoat on over bare metal?

Guys,

I'm re-doing the undercarriage of my 70 GTO and about to re-undercoat it. During the process of thoroughly cleaning the gunk/old undercoating off I've exposed bare metal on much of the underbody. Do I need to prime and even paint it before I undercoat it? I'm assuming it was primed/painted from the factory before the dealer applied the undercoating when it was originally built and sold, so there must have been primer and paint from the factory, no? I'm not concerned with replicating the factory process, just whether it's recommended for protective purposes that I apply primer/paint prior to undercoating it. Thanks for your help.

Mike

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Old 07-21-2019, 03:57 PM
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Epoxy prime it. Undercoat doesn't like to stay on bare metal
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Old 07-21-2019, 04:45 PM
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Quote:
Originally Posted by ml69 View Post
Guys,

I'm re-doing the undercarriage of my 70 GTO and about to re-undercoat it. During the process of thoroughly cleaning the gunk/old undercoating off I've exposed bare metal on much of the underbody. Do I need to prime and even paint it before I undercoat it? I'm assuming it was primed/painted from the factory before the dealer applied the undercoating when it was originally built and sold, so there must have been primer and paint from the factory, no? I'm not concerned with replicating the factory process, just whether it's recommended for protective purposes that I apply primer/paint prior to undercoating it. Thanks for your help.

Mike
I would not undercoat it. Prime and paint it.
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Old 07-21-2019, 05:15 PM
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Ha... Epoxy primer, then paint, then undercoat. The primer is for adhesion, the paint seals out moisture, the undercoat prevents chipping. Fair 'nuf?

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Old 07-22-2019, 03:12 PM
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Ok. I'll prime/paint before I undercoat it. If this were a frame off I wouldn't undercoat it but I can't completely clean it out by the frame rails where the old undercoat is still there so I think it would look weird to be partly undercoated and partly painted. Thanks.

Mike
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Old 07-24-2019, 09:22 AM
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So I primed it and I'm kinda liking how it looks and thinking now that maybe I wont undercoat it after all. Can someone tell me what the proper shade of black should be if I wanted to go with something that would look correct? The car is black. Should it be gloss black, semi-gloss, flat? Thanks.

Mike
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Old 07-24-2019, 12:59 PM
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I'd go semi and kinda fade it out into the surrounding area. You could also apply a rocker panel chip guard type of coating before black if a little texture would help. Just another way there. But originally it may have been almost shiny like a chassis black. No matter, once a film of road dirt from use accumulates, it will even out the look.
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Old 07-24-2019, 03:59 PM
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Sounds good that's what I'll do.
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Old 07-24-2019, 04:00 PM
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Quote:
Originally Posted by ml69 View Post
So I primed it and I'm kinda liking how it looks and thinking now that maybe I wont undercoat it after all. Can someone tell me what the proper shade of black should be if I wanted to go with something that would look correct? The car is black. Should it be gloss black, semi-gloss, flat? Thanks.

Mike
I'm glad you decided not to undercoat it. Check out AG 111 chassis paints in satin black. This finish paint was developed for the New York City subway system. It's as tough as paint gets
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Old 07-25-2019, 09:31 AM
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Thanks I'll check it out.
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