Undercoating bottom of hood? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

muddpile · 06-11-2007, 09:13 PM

Can I use undercoating on the underside of my hood? I'd rather a black textured look than orange painted, and I figure this is the easiest/cheapest way to do it. Will it handle the heat and stick good, or am I better off with something else? I have cleaned/sanded it multiple times, so it is well prepped for something. Thanks!

Green Machine · 06-11-2007, 09:32 PM

Personally I wouldn't do it, but if you have to use something I guess I would try a spray can bed liner, give some texture and will resist most underhood fluids. If oil or gas got on the undercoat you would have a big sticky mess of tar all over. My 2 cents..........

eedgell · 06-11-2007, 10:06 PM

I have thought of doing this at some point, but I would take it to a rhino line, or some such place, dealer to be done by a professional. I thought it would help with the hood rattle. I have seen some of our hoods on 4x4's that run on rough roads all the time that have cracked as a result of flex. Maybe this would help?

muddpile · 06-12-2007, 12:47 AM

I wondered about the oil and gas issue too... If I recall, it deteriorates this product. Thanks for the tip.

CrashEd · 06-12-2007, 03:12 AM

LOL!! i bought one truck and the PO found that yard sticks were good to cut down on the rattle. Anyone need a yard stick i have lots of them.
Ed

Mudder · 06-12-2007, 06:55 AM

Would be hard to keep clean. The underside of my hood actually catches bugs. Mine is the same as the exterior. Those are my thoughts.

Richard H. · 06-12-2007, 07:58 AM

Mudpile , the bed on my dorf 250 has something like Rhino and I think it would be to heavy for the hood and springs , it's tough but it is like an 1/8 inch thick!
I have a remote spot welder and have been tossing around in my head to weld studs in to use insulation as a rattle dampner. Just a thought, RH

GMC Jim · 06-12-2007, 08:25 AM

I used a piece of commercial felt carpet pad ( 1/2 -5/8 thick)...This pad is quite dense compared to the felt pads I have seen some years ago used in home applications. Used construction cement ( Panel adhesive ) in a caulk gun... applied the caulk in 1/4" beads spaced about 6-12 inches apart. I also used about a number of plastic push- in attach clips in the hood rib areas... Got these from a junk yard, these are used in some car trunks and hood liners to hold the sound deadening material in place.

fun in dirt · 06-12-2007, 09:25 AM

Don't use the spray can bed liner. Used it on a firewall one time & it only last about5 months.

**Yukon Jack** · 06-12-2007, 09:44 AM

I'm a bit concerned also about the weight issue. My hood on my K5 vibrates a fair amount at idle and I would be worried about the effect of that extra weight.

JameslovesJammie · 06-12-2007, 10:37 AM

What about por-15? Wouldn't be as thick and heavy as rhino liner and won't deteriorate if chemicals get on it?

kawahawk · 06-12-2007, 11:13 AM

how about a high heat flat black like for a weber grill?

muddpile · 06-12-2007, 12:35 PM

Hi heat spray paint was another thought of mine. Sound deadening and heat aren't my major concerns, but rather appearance.

mrein3 · 06-12-2007, 01:08 PM

I had a quart of black DuPont Centuri left over that I bought in 1986. Two years ago I used a 3M 'sandblaster' disk in my grinder to take the hood down to bare metal. I prepped that and sprayed it with PPG epoxy. Over the epoxy I sprayed the single stage black. Two years later it still looks good.

It is a dead bug magnetic howerver.

One more thing. I masked off the braces when I sprayed the black. Then masked the black off and sprayed the body color on the braces.

Aarons72s · 06-12-2007, 01:56 PM

The spray can bedliner, duplicolor, definetly needs to be painted or it will fade and peal in no time. Dont ask how I know. Id take it and have it sprayed by line-x, rhino, or whatever bed liner places you have. Just specify them to apply it thinly. I have seen some applied thick and others applied thin.

EAST SIDE LOW LIFE · 06-12-2007, 02:31 PM

I would be careful what I used on the underside of the hood (fire safe) is what you need to think about as well as durability and appearance. I like SEM products as they fit the above criteria. Also you will want something that you can freshen up easily if things start to look a little bit like this was done 5 years ago, if you know what I mean. SEM makes a textured paint product as do allot of other companies.

High heat paint is really not a big concern as the factory never used it and most paint will handle the heat generated in an engine compartment.

esll.

06-11-2007, 09:13 PM	#1
muddpile Registered User Join Date: Dec 2004 Location: Saskatchewan, Canada Posts: 1,371	Undercoating bottom of hood? Can I use undercoating on the underside of my hood? I'd rather a black textured look than orange painted, and I figure this is the easiest/cheapest way to do it. Will it handle the heat and stick good, or am I better off with something else? I have cleaned/sanded it multiple times, so it is well prepped for something. Thanks! __________________ 1964 Chevy Short Fleet: Tornado 1972 Chevy C10: Fast Orange Secondaries Wide Open

06-11-2007, 09:32 PM	#2
Green Machine Senior Member Join Date: Jul 2004 Location: Estherville, Iowa Posts: 3,371	Re: Undercoating bottom of hood? Personally I wouldn't do it, but if you have to use something I guess I would try a spray can bed liner, give some texture and will resist most underhood fluids. If oil or gas got on the undercoat you would have a big sticky mess of tar all over. My 2 cents.......... __________________ 1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0

06-11-2007, 10:06 PM	#3
eedgell It's the air up here Join Date: Mar 2007 Location: Western Colorado Posts: 710	Re: Undercoating bottom of hood? I have thought of doing this at some point, but I would take it to a rhino line, or some such place, dealer to be done by a professional. I thought it would help with the hood rattle. I have seen some of our hoods on 4x4's that run on rough roads all the time that have cracked as a result of flex. Maybe this would help? __________________ 1971 cheyenne k10 4 speed np 205 454 BB factory a/c Never drink down stream of the herd! Eric

06-12-2007, 12:47 AM	#4
muddpile Registered User Join Date: Dec 2004 Location: Saskatchewan, Canada Posts: 1,371	Re: Undercoating bottom of hood? I wondered about the oil and gas issue too... If I recall, it deteriorates this product. Thanks for the tip. __________________ 1964 Chevy Short Fleet: Tornado 1972 Chevy C10: Fast Orange Secondaries Wide Open

06-12-2007, 03:12 AM	#5
CrashEd 72 chevy Join Date: Jan 2007 Location: Central Il Posts: 725	Re: Undercoating bottom of hood? LOL!! i bought one truck and the PO found that yard sticks were good to cut down on the rattle. Anyone need a yard stick i have lots of them. Ed

06-12-2007, 06:55 AM	#6
Mudder Registered User Join Date: Feb 2001 Location: East Central, MO Posts: 11,336	Re: Undercoating bottom of hood? Would be hard to keep clean. The underside of my hood actually catches bugs. Mine is the same as the exterior. Those are my thoughts.

06-12-2007, 07:58 AM	#7
Richard H. Spanked once Join Date: Oct 2006 Location: Intheshop, Indiana Posts: 969	Re: Undercoating bottom of hood? Mudpile , the bed on my dorf 250 has something like Rhino and I think it would be to heavy for the hood and springs , it's tough but it is like an 1/8 inch thick! I have a remote spot welder and have been tossing around in my head to weld studs in to use insulation as a rattle dampner. Just a thought, RH

06-12-2007, 08:25 AM	#8
GMC Jim Senior Member Join Date: Dec 2002 Location: Portland, Oregon Posts: 901	Re: Undercoating bottom of hood? I used a piece of commercial felt carpet pad ( 1/2 -5/8 thick)...This pad is quite dense compared to the felt pads I have seen some years ago used in home applications. Used construction cement ( Panel adhesive ) in a caulk gun... applied the caulk in 1/4" beads spaced about 6-12 inches apart. I also used about a number of plastic push- in attach clips in the hood rib areas... Got these from a junk yard, these are used in some car trunks and hood liners to hold the sound deadening material in place. __________________ '71 GMC;fleetside;PB/PS/AC/CC/402 Eng./Custom Paint/110,000act miles/3 fuel tanks(52gal).

06-12-2007, 09:25 AM	#9
fun in dirt Registered User Join Date: Jan 2007 Location: Mississippi Posts: 2,121	Re: Undercoating bottom of hood? Don't use the spray can bed liner. Used it on a firewall one time & it only last about5 months. __________________ '72 C to K20 "Cannibalizer" http://67-72chevytrucks.com/vboard/s...32#post8653432 '85 K30 "Big Nassy" '01 2500 Suburban ...party wagon & tow truck '06 Silverado SS...DD '06 C1500 WT...DD '07 Classic C1500 WT...DD Built & sold cause can't keep 'em all: '72 Blazer "The Bucket" http://67-72chevytrucks.com/vboard/s...d.php?t=433190 '55 Chevy straight axle gasser https://www.trifive.com/forums/showthread.php?t=173938 '69 Pro Street Chevelle http://www.chevelles.com/forums/showthread.php?t=332541 '86 M1031 CUCV http://67-72chevytrucks.com/vboard/s...d.php?t=553619

06-12-2007, 09:44 AM	#10
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,684	Re: Undercoating bottom of hood? I'm a bit concerned also about the weight issue. My hood on my K5 vibrates a fair amount at idle and I would be worried about the effect of that extra weight. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

06-12-2007, 10:37 AM	#11
JameslovesJammie God Bless Mr. T Join Date: Apr 2004 Location: Minot, ND Posts: 348	Re: Undercoating bottom of hood? What about por-15? Wouldn't be as thick and heavy as rhino liner and won't deteriorate if chemicals get on it? __________________ Like a midget at a urinal...sometimes you must stay on your toes.

06-12-2007, 11:13 AM	#12
kawahawk Junior Member Join Date: May 2007 Location: Council Bluffs, Iowa Posts: 41	Re: Undercoating bottom of hood? how about a high heat flat black like for a weber grill? __________________ '72 Cheyenne K-10 LWB '05 Jeep Wrangler Willy's Edition '07 Victory Vegas '99 Subaru Legacy SUS

06-12-2007, 12:35 PM	#13
muddpile Registered User Join Date: Dec 2004 Location: Saskatchewan, Canada Posts: 1,371	Re: Undercoating bottom of hood? Hi heat spray paint was another thought of mine. Sound deadening and heat aren't my major concerns, but rather appearance. __________________ 1964 Chevy Short Fleet: Tornado 1972 Chevy C10: Fast Orange Secondaries Wide Open

06-12-2007, 01:08 PM	#14
mrein3 Registered User Join Date: Feb 2000 Location: Center City, MN, USA Posts: 3,253	Re: Undercoating bottom of hood? I had a quart of black DuPont Centuri left over that I bought in 1986. Two years ago I used a 3M 'sandblaster' disk in my grinder to take the hood down to bare metal. I prepped that and sprayed it with PPG epoxy. Over the epoxy I sprayed the single stage black. Two years later it still looks good. It is a dead bug magnetic howerver. One more thing. I masked off the braces when I sprayed the black. Then masked the black off and sprayed the body color on the braces. __________________ '70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN

06-12-2007, 01:56 PM	#15
Aarons72s Registered User Join Date: Apr 2006 Location: oklahoma Posts: 10,670	Re: Undercoating bottom of hood? The spray can bedliner, duplicolor, definetly needs to be painted or it will fade and peal in no time. Dont ask how I know. Id take it and have it sprayed by line-x, rhino, or whatever bed liner places you have. Just specify them to apply it thinly. I have seen some applied thick and others applied thin.



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06-12-2007, 02:31 PM	#16
EAST SIDE LOW LIFE Senior Member Join Date: Mar 2007 Location: VANCOUVER ISLAND, B.C., Canada Posts: 1,602	Re: Undercoating bottom of hood? I would be careful what I used on the underside of the hood (fire safe) is what you need to think about as well as durability and appearance. I like SEM products as they fit the above criteria. Also you will want something that you can freshen up easily if things start to look a little bit like this was done 5 years ago, if you know what I mean. SEM makes a textured paint product as do allot of other companies. High heat paint is really not a big concern as the factory never used it and most paint will handle the heat generated in an engine compartment. esll. Attached Images __________________ Tomorrow is for doing today's stuff. ************************************* This truck has just the right amount of energy for me! Author: Warren Lake .... (member) Last edited by EAST SIDE LOW LIFE; 06-12-2007 at 02:33 PM.

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