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8/12/12 2:04pm - Original Message: 'Under Hood Paint'
manget1 Lifetime Member
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Indianapolis, IN - USA

Vette(s):
Silver 1974 Convertible - L82 4 speed Low miles (was only 8,900 when I bought it in March 2006) - Now 42K miles. Original owner bought it as an investment for son's college expenses. 2008 Jetstream Blue Convertible - DAILY DRIVER!!

Joined: 9/3/2006
Posts: 2382
Instead of stealing The Rook's thread on the under hood specialized mats, I'll start a new one to ask what folks out there know about custom paint jobs inder the hood.
 
It's my understanding that the hood insulation mat is there because the engine could get so hot, it could buble the paint on the outside of the hood.  Is that true?
 
My preference would be to get rid of the mat and have a custom paint job done inside.  If I were to do that, is there something that could be put down before the paint to protect the outside of the hood?  What about the custom paint I have put on the inside?  What's the danger of my 1974 L-82 engine damaging the design?  I recently had my engine repainted with Chevy Orange that is supposed to stand up to heat, and I know it has baked off in a few spots.
 
Interested in anyone's experience or thoughts on this topic


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8/12/12 5:02pm - Reply: 'Re: Under Hood Paint'
ebo Lifetime Member
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Holland Patent, NY - USA

Vette(s):
#1 *1980 White, Red interior 14,000 mile #2 *1980 Red, Oyster interior 93,000 miles Resto project car, rebuilt to 383 stroker

Joined: 6/3/2008
Posts: 4395
Good question, my 80's hves no insulation on the underside.
Evil Smileebo


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Evil Smileebo
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8/12/12 7:52pm - Reply: 'Re: Under Hood Paint'
Sarge81 Lifetime Member
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WEST SENECA, NY - USA

Vette(s):
1981 Blue Ice Met. w/pearl ghost flames TKO500 5speed. LS1 Swap 3.45 Dana 44.

Joined: 12/3/2001
Posts: 2376
Yep, '80-'82's did not have hood insulation. But I'll tell you what. After I had my car painted I noticed that the hood lost its shine compared to the rest of the car. A few years ago I put an L88 style hood on the car and it was painted with the same batch of paint as before. We did take some silver foil faced insulation cut to fit and put a border around it to finish off the edge. The paint on the hood stayed as shiny as the rest of the car now. The underside of the hood was finished and painted black and clear coated.

If you click on the link below my signature pic it will take you to my Car Domain. Scroll down and there is a pic of the underside of my hood. Maybe this might give you some ideas of what you may want to do.

Sarge


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GEN III 5.7L "LS6" Engine swap
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Born 8/1981
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9/17/12 7:53am - Reply: 'Re: Under Hood Paint'
VikingVette
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Greer, SC - USA

Vette(s):
1978 Black with Viking mural painted under hood AM/FM/CB radio, T-top and a 2013 Cyber Gray Grand Sport Coupe, 2LT for my daily driver

Joined: 3/13/2012
Posts: 264
Marshall,
I apologize for not seeing this thread sooner.  do you remember the Viking Mural under my hood?  The artist used high temperature paint.  I left four prongs under the hood for the insulation blanket so I could attach it for long runs, but that blanket marred my brand new chrome air cleaner cover going to charleston, so now I do not use it.  I have seen no detremintal affects on the paint of the hood from the outside, nor on the mural.  Everytime I do pull into the garage, I pop the hood and use a plastice coffee bucket to keep the hood open a little bit to assist in letting any heat escape.
Sorry that I did not answer you sooner...and what is my experience may not be typical...remember, I am just dumb-bell.
 


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Warning: The surgeon general has declared that it is NOT unhealthy to smoke your competition AND I just discovered that my corvette is a hybred.  It burns gas and rubber! 
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9/17/12 5:27pm - Reply: 'Re: Under Hood Paint'
CCasey
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New Albany, OH - USA

Vette(s):
1980 Coupe / Snowcrest White / L48, 350 / Comp Cam / Edelbrock Heads / Cyclone Intake / Holley Carb / Holley Fuel Pump / Patriot Headers / Dual Exhaust / Magnaflow Mufflers / 1964 Coupe / Riverside Red / L76, 327, 365hp

Joined: 8/17/2010
Posts: 173

Whenever possible, I always open the hood completely after a drive and leave it that way until the engine has cooled.  I have no insulation on my '80 and have never seen any evidence that the paint has diminished.



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9/21/12 6:29pm - Reply: 'Re: Under Hood Paint'
LarryT
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Worthington, OH - USA

Vette(s):
1972 Black C3 automatic with red interior. Options include AC, PS, PB, Am/Fm Wonderbar stereo.

Joined: 8/4/2009
Posts: 74

I do not have any matting or thermal barrier under the hood.  When I had the car painted, the inside of the hood was painted black and clear coated (to match the car).  This was done a couple of years ago and I have not noticed any problems.  Although I must admit, you do now have me a little worried.  To my knowledge the í72 cars didnít come with a mat and never occurred to me to add one, since none existed when the car came from the factory.



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9/22/12 2:39pm - Reply: 'Re: Under Hood Paint'
F4Gary Gold Member
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 862
Mine didn't come with mat.  Clear coat paint on top is just fine.

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9/22/12 5:20pm - Reply: 'Re: Under Hood Paint'
LarryT
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Worthington, OH - USA

Vette(s):
1972 Black C3 automatic with red interior. Options include AC, PS, PB, Am/Fm Wonderbar stereo.

Joined: 8/4/2009
Posts: 74
It looks like you too have a 1972.  Only difference is yours appears to be a big block car.  Very nice.

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- Larry Tanner

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1972 Coupe
Black with Red interior
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11/18/12 6:37pm - Reply: 'Re: Under Hood Paint'
tonytheroofer
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Rochester, NY - USA

Vette(s):
1980 L- 82 fully restored and upgraded.

Joined: 6/12/2012
Posts: 95
I have never seen or herd of engine heat boiling or bubbling paint off a hood . Personally to somehow doubt it will be an issue unless you have a few turbos under there .. 

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11/19/12 1:18pm - Reply: 'Re: Under Hood Paint'
2 cruzn Lifetime Member
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Poquoson, VA - USA

Vette(s):
73 Conv, Blue-Green/White Top - 454, M21 - Dark Saddle Leather, Power Windows, A/C, Tilt/Tele, AM/FM St. (orig. and sounds like it too).#2 -- 2007 Coupe,3 LT package, Z51 option, Victory Red, Ebony Int. Clear Top.

Joined: 11/20/2004
Posts: 1023
I don't know if this is related... but I know a few guys with C-2's and no insulation, they claim... when they open the hood at shows... the sun reflecting off the chrome breather will affect the paint on the opposite side of the hood. Most of them put a towel over the breather..

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11/19/12 3:34pm - Reply: 'Re: Under Hood Paint'
DaveM Lifetime Member
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Flanders, NJ - USA

Vette(s):
1982 Black, ZZ4, Hooker Side Pipes, 3.55 Rear, Rebuilt & upgraded 700R4, All new suspension, brakes, & new Charcoal interior.

Joined: 1/27/2004
Posts: 2530

The inside of my hood is bare also, never had any issue with heat affecting the paint. Personally I think the hood sees more heat from a hot sun in the summer than from the engine, (dark colors mostly).

Dave


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11/19/12 9:34pm - Reply: 'Re: Under Hood Paint'
corvette440hp Lifetime Member
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Joined: 7/2/2006
Posts: 8205
DaveM said:

The inside of my hood is bare also, never had any issue with heat affecting the paint. Personally I think the hood sees more heat from a hot sun in the summer than from the engine, (dark colors mostly).

Dave

Dave, I'm with you 100%Thumbs Up

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11/20/12 1:56pm - Reply: 'Re: Under Hood Paint'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19447
The biggest issue with paint damage from under the hood is chemicals wicking up thru the bottom side of the hood, mainly A/C compressor oil, but also fuel and oil vapors. The hood insulation was really more of an attempt to quieten down some of the fan and engine noise than to protect the hood, tho it does a fine job of doing that. Some '69s had a short insulation piece over the radiator area to keep heat from soaking into the hood in that area, and from there, the insulation just grew. The composition of the hood panels also changed over the years(as did the quality of the paint used), so some years dint ever have the insulation panels.
I have seen MANY hoods with paint damage from wicking chemicals, and 90% of that damage is directly above the A/C compressor clutch. The compressor oil just slowly seeps into the bottom of the hood, and migrates to the top side, under the paint, and then causing the paint to bubble, or flake.

Lots of guys do use a towel, or a special cover to put over their air filter tops when showing with the hood up. The sun reflecting off of a shiny chrome filter lid CAN definitely burn the paint on the hood....think of using a magnifying glass on ants when you was a kid(you know you did!).....same thing. I use a towel on mine, cause I'm too cheap to buy one of the purdy ones like this....


http://www.parts123.com/parts123/yb.dll?parta~dyndetail~Z5Z5Z50000050g~Z5Z5Z520992~P54.95~~~~S3ND0RDK6H71123117970a~Z5Z5Z5~Z5Z5Z50000050G



|UPDATED|11/20/2012 10:56:07 AM (AZT)|/UPDATED|


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