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Old 09-12-2017, 09:56 AM
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Your choice for chassis / underbody coating

Wondering what you all would choose to put on the bottom of a sand blasted and epoxy primed unibody car.


My thought was either chip guard or matte black single stage urethane.


Are there better options? If I go with chip guard, can anyone advise on the best product to chose? SEM 1k, 2k? I see they have both.

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Old 09-12-2017, 10:28 AM
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I would go with the single stage urethane. It is a lot more forgiving if you ever need to do work under there and it is easily touched up. The paint will also let the underbody breath and it will not lock water into the seams like chipgard or undercoating tends to do.
Mark
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Old 09-12-2017, 04:20 PM
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Quote:
Originally Posted by astroracer View Post
I would go with the single stage urethane. It is a lot more forgiving if you ever need to do work under there and it is easily touched up. The paint will also let the underbody breath and it will not lock water into the seams like chipgard or undercoating tends to do.
Mark
thanks. good input!
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Old 09-12-2017, 06:23 PM
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It doesn't have to be an either / or situation, a currently popular choice in my area is applying a textured chip resistant rocker guard coating then paint.
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Old 09-12-2017, 06:56 PM
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Quote:
Originally Posted by idrivejunk View Post
It doesn't have to be an either / or situation, a currently popular choice in my area is applying a textured chip resistant rocker guard coating then paint.
Any recommendations on chip guard? I see 2K SEM, 1K SEM, 2K Dominion. 1K SEM with the option of touching up with rattle cans some day sounds appealing, but only if it works well.
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Old 09-12-2017, 07:17 PM
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I only see it done using 3M rocker guard, either from a quart through a shutz gun or the "no cleanup" setup they offer. Body color is usually chosen for underneath and flat clear is used over it but that could just as well be single stage black urethane. If I had to have just one thing sprayed underneath though, I pick the SS black paint. What you are talking about sounds like catalyzed or uncatalyzed undercoating and I have no experience with that. SEM makes quality products, I'll say that.
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Old 09-24-2017, 07:57 PM
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We have left them in SPI Epoxy primer (red oxide or black depending on owner preference), painted over the epoxy, and used raptor liner on the bottoms of them as well. If it is a rarely driven show vehicle or an auction ride, I'd suggest epoxy or paint. If it will see the highway pretty regularly, I recommend raptor liner or a similar air cured spray on bedliner. I don't usually suggest rhino or linex type products, due to their thickness. Just what we do here.

Kelly
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Old 10-16-2017, 09:33 AM
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One of my customers had local shop do a Rhinoliner? on inside of his pickup bed. Unlike regular bedliner its flexible, you can press fingernail into it and it will flex. I think it would be great undercoating material that would resist any rocks as they would just bounce off of it.
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Old 12-07-2017, 10:00 PM
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I always uses a Rust -oleum red oxide primer--oil base on rusty metal first--and mixed 1 gallom gloss black and 1 gallon flat together---that gives you a seim-gloss look.I used it on the chassic and under hood.
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