Undercoating in engine bay? - Vintage Mustang Forums
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post #1 of 33 (permalink) Old 05-10-2019, 08:57 PM Thread Starter
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Undercoating in engine bay?

Has anyone used undercoating in their engine bay? I was talking to a paint a body guy today who suggested it and even showed me another mustang he had done it in. Didnít look half bad - had a satin black look with a subtle texture, and I suppose it would be a little tougher/more scratch resistant?

Thoughts? Would it fade? Attract dirt, grease, dust, etc? Other issues?

Obviously this wouldnít work if your going for the concourse look, but otherwise?


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post #2 of 33 (permalink) Old 05-10-2019, 09:17 PM
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After spending several days removing old coating of some kind from my engine bay so I could re-spray it, decided not to spray undercoat back in there. I took it to metal, sprayed it with 3 coats of black epoxy then top coated it with 3 coats of hot rod satin black urethane paint. It should be pretty durable. I still need to get some kind of a thermal shield for the headers back at the fire wall. I haven't installed that yet. I'm looking for something I can rivet on so it doesn't put glue everywhere.


I did consider the thermal version of lizzard skin.


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post #3 of 33 (permalink) Old 05-10-2019, 11:12 PM
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Couldn't think of a worse coating for the engine bay than undercoating IMO. 2-3 coats of epoxy primer and your choice of top coats. I used Eastwood Epoxy Primer and Satin Chassis Black Extreme.
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post #4 of 33 (permalink) Old 05-10-2019, 11:13 PM
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undercoating, in my opinion is too soft, collects dirt and cant really be cleaned. If you're going after that look I might suggest a urethane bedliner like upol raptor liner. You can get different textures by spraying at different air pressures, it cures hard, takes a beating, and can be scrubbed. It may however be horrible to remove down the road if the need arises.
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post #5 of 33 (permalink) Old 05-10-2019, 11:17 PM Thread Starter
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Thanks for the replies @macstang @cruising68 @Lightning. Any good tricks you have seen/done to get a satin black finish that is easy to keep/stay clean? Iíve heard of some people using a flat black paint with a clear over it... thoughts?


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post #6 of 33 (permalink) Old 05-10-2019, 11:26 PM
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I recently redid mine using SEM trim black, for my application I bought a quart and sprayed it with a gun but its available in aerosol too. Its got a satin finish, and I just wash it with a car wash mitt and it looks new again.

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post #7 of 33 (permalink) Old 05-10-2019, 11:43 PM
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Clean, clean, and clean again. Multiple thin coats are better than heavy coats. Allow the proper flash time between coats. As I mentioned, I used the Eastwood satin Chassis Black extreme for my topcoat. Supposed to have ceramic in it and it is an epoxy. Went for the extreme for resistance to chemicals. I can tell you this, I spilled quarts of brake fluid in the engine compartment sorting out my new brakes. Had many leaks, many flushes, many spills. Finally got the brakes sorted out and cleaned the engine bay and it looks new. Happy so far but no long term review. Just my humble opinion.

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post #8 of 33 (permalink) Old 05-10-2019, 11:49 PM
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You can spray a flat black or even a single stage urethane black and then shoot a satin urethane clear on top if it is compatible with clear. I would stay with the urethanes.



Just look for this in the information and you should have something that will last;



highly resistant to harmful UV exposure, dangerous chemicals, everyday weathering, and aggravating stone chips


Most fully cured urethanes are gas resistant too unless the information says otherwise.


Once you have sprayed it all you can still go back, mask off certain areas and shoot something like lizzard skin which I am somewhat familiar with or Raptor I hear is also good. I latched onto lizzard skin because they sell a thermal coating and a standard sound proofing coating.


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post #9 of 33 (permalink) Old 05-11-2019, 12:01 AM
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No to undercoating.

Those that throw professional level paint guns around on a regular basis may disagree, but Iím a fan of your favorite finish of black rattle can. Buy a couple extra cans and enjoy the convenience of easily fixing the nicks and stains and whatever that can eventually junk up your pretty engine bay. 15ish Yearís later and mine still looks nice because I can touch it up so easily.
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post #10 of 33 (permalink) Old 05-11-2019, 12:05 AM
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Originally, In the engine bay, The factory used Undercoating on '64.5-'66 cars lightly on the firewall. Would not use it anywhere else but light on the firewall like original.

If you are going for a certain Undercoated "look", You can always use a product like Lizard Skin Bedliner. I would advice using regular undercoating if you want that "look" in the entire engine bay as the heat will in the engine bay among other things will make a lot of it just chip off.. LINE-X Bedliner is also good.

)

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post #11 of 33 (permalink) Old 05-11-2019, 08:18 AM
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Just curious if anyone has used body color in the engine bay? Iím sure black flat or satin is popular because it hides dirt and does not show as much of the wavy engine bay panels. Maybe body color base and satin clear just in the bay?


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post #12 of 33 (permalink) Old 05-11-2019, 09:24 AM
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Satin black is popular because it is the color that Ford used when they produced these cars.


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post #13 of 33 (permalink) Old 05-11-2019, 09:41 AM
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Quote:
Originally Posted by blinn View Post
Just curious if anyone has used body color in the engine bay? Iím sure black flat or satin is popular because it hides dirt and does not show as much of the wavy engine bay panels. Maybe body color base and satin clear just in the bay?


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post #14 of 33 (permalink) Old 05-11-2019, 09:48 AM
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"Just curious if anyone has used body color in the engine bay?"

That's a No-No for Ford and GM guys....and ONLY Reserved for MOPAR Lovers..... lol....

)

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post #15 of 33 (permalink) Old 05-11-2019, 09:58 AM
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