Underside Coating Preference - Chevelle Tech
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post #1 of 15 (permalink) Old Jan 22nd, 20, 1:51 PM Thread Starter
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Mike
 
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Underside Coating Preference

Hey Guys, I was going to replace my rusted out wheel wells. Before I install, do you have a preference of coating to prevent chips and rusting? Part of me wants to try that lizard skin but I haven't read many long term reviews. Or should I just spray a couple heavy coats of epoxy on them and maybe top with an industrial 2 part Urethane like an Imron?

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post #2 of 15 (permalink) Old Jan 22nd, 20, 3:29 PM
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Re: Underside Coating Preference

I used the Rator bed liner in all the wheelwells and body underside

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post #3 of 15 (permalink) Old Jan 22nd, 20, 3:39 PM
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Re: Underside Coating Preference

I painted my underbody and wheelwells with Chassis Shield epoxy, and sprayed only the wheel wells with 3M rattle can undercoating. Looks good, not too heavy and provides some road noise reduction. I used the same undercoating on the inside of the new door skins too.
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post #4 of 15 (permalink) Old Jan 22nd, 20, 4:59 PM
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Jon
 
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Re: Underside Coating Preference

I sprayed my car in the lizards skin a few years ago and I love. it. When I did it I sprayed the inside of the car and door, not as a undercoat. I am honestly not sure how well it would hold up as an undercoat, but it is very good stuff.

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post #5 of 15 (permalink) Old Jan 23rd, 20, 9:49 AM
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Jeff
 
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Re: Underside Coating Preference

Lubriplate spray grease. It dry's to a nice dull black and keeps the steel in grease..

https://www.mscdirect.com/browse/tnp...SABEgKnoPD_BwE

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post #6 of 15 (permalink) Old Jan 23rd, 20, 12:02 PM
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Re: Underside Coating Preference

I used Rustoleum Truck Bed Liner for under body. I used brush-on for most of it and spray-on for the tight areas. I also used Eastwood Chassis Black for the outside of the frame and Internal Frame Coating on the inside of the frame. I ground the old crap off with a stiff knotted cup type wire wheel and angle grinder first, washed it all down with solvent, and rolled on the bed liner. It's a very very dirty job, but worth it. Doing it this way also changes the color of everything in the shop.




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post #7 of 15 (permalink) Old Jan 23rd, 20, 12:45 PM
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Re: Underside Coating Preference

I used Raptor Liner under the car and used Lizard skin two stage sound/heat barrier I side the car.

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post #8 of 15 (permalink) Old Jan 23rd, 20, 2:51 PM Thread Starter
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Mike
 
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Re: Underside Coating Preference

A lot of good ideas and products used here. My first go around with the fenders I have were coated with coal tar epoxy, which held up great over the 7 years since I patched them. I'm leaning towards doing epoxy coating again, but not as thick a product, then topping with an undercoating. But I'll see what else people have done

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Gen IV 454 (out of C30 ), 390 heads 1.88/2.19 valves by Vortecpro, with ISKY Hyd Roller cam (at 050 218 int./228 exh, lift 530 int./552 exh.), RPM performer intake, Fitech 600HP, Dougs headers, and M21, Gear Vendors OD, 3.73's, UMI Suspension, Viking coilovers.
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post #9 of 15 (permalink) Old Jan 23rd, 20, 2:57 PM
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Fat Stig
 
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Re: Underside Coating Preference

I don't remember the brand name, Rustoleum maybe. It was basically POR-15 with little chunks of rubber in it. I did the underside of the body about 9 years ago, still looks great. I first wire wheeled the original parts of the floor (basically just the bit between the rear seat pan and the trunk pan), scuffed the e-coated bits, painted the original metal with POR-15, then when the POR was still tacky, painted the entire underside with SPI epoxy, then the undercoat.

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Originally Posted by jpete, Dean, Derek69SS, hoffbug, rubadub, Grandsport, Thomas Jefferson, 1badss396, MEJ1990TM, and mrdjc99
As usual, Andy is right
If it doesn't fit, force it. If it breaks, it needed to be replaced anyway.

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post #10 of 15 (permalink) Old Jan 23rd, 20, 6:02 PM
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I used Hercules after I installed new rockers on the Avalanche. Took 2 coats and had rubber chunks in it. Came out pretty well.
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post #11 of 15 (permalink) Old Jan 23rd, 20, 8:17 PM
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Fat Stig
 
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Re: Underside Coating Preference

Quote:
Originally Posted by 72soft-top View Post
I used Hercules after I installed new rockers on the Avalanche. Took 2 coats and had rubber chunks in it. Came out pretty well.
That's what I used. Your post jogged my memory.

Quote:
Originally Posted by jpete, Dean, Derek69SS, hoffbug, rubadub, Grandsport, Thomas Jefferson, 1badss396, MEJ1990TM, and mrdjc99
As usual, Andy is right
If it doesn't fit, force it. If it breaks, it needed to be replaced anyway.

I have to keep reminding myself this isn't a Z16 convertible, Evening Orchid Camaro, or factory 1966 SS427 and get on with it.


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post #12 of 15 (permalink) Old Jan 23rd, 20, 9:04 PM
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Scott
 
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Re: Underside Coating Preference

Twenty years ago I shot my floors with epoxy followed by Duracryl (if any one remembers what that is). After a frame off resto, nothing underneath is failing after 40K miles. And I drive my car in the rain and down dirt roads. Willing to bet most don't even take their car out if they see one cloud in a sky of blue. I do this work every day and am well aware of protective products available. You guys will be dead before your cars even begin to fail or rot.
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post #13 of 15 (permalink) Old Jan 24th, 20, 1:17 PM
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Caleb
 
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Re: Underside Coating Preference

Had the same question a few months ago. Basically, my plan on mine is to strip the EDP coating (from AMD) from the new floor/trunk pans, re-shoot a two-part epoxy, seam seal the heck out of it, then use POR Bedliner (or some other bedliner coating; I'm open to anything regardless of cost; that being said I'm shying away from POR Bedliner as its a 'water-based' coating; change my mind).

I plan on putting my body on a tip-over jig to make this easy. I've found a few threads showing how to build this contraption.

Obviously, this may be over kill for a 'fair weather car' but we don't want to do this stuff twice. And I'm in my 20's so I'm sure we will run out of gas before my car needs rust repair...
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post #14 of 15 (permalink) Old Jan 25th, 20, 12:26 PM
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Re: Underside Coating Preference

Quote:
Originally Posted by roketengineer View Post
Obviously, this may be over kill for a 'fair weather car' but we don't want to do this stuff twice. And I'm in my 20's so I'm sure we will run out of gas before my car needs rust repair...
LOL - Good one!
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post #15 of 15 (permalink) Old Jan 25th, 20, 4:20 PM
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Re: Underside Coating Preference

Just a friendly reminder, I've posted this before. if you are removing ORIGINAL GM undercoating prior to recoating, the original GM undercoating in the wheel wells contained asbestos in a bituminous base, HAZMAT precautions-suits and respirator would be an excellent precaution....remember Steve McQueen and his Navy asbestos exposure...FWIW
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