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Hood structure bonding #2878058 01/21/21 08:30 PM 01/21/21 08:30 PM
Joined: Aug 2011 Posts: 21 n h S sawduster OP member
sawduster OP member S Joined: Aug 2011 Posts: 21 n h	69 RR hood. The bonding is gone. What do I use to re-bond the the hood skin to the under structure? Thanks in advance.

Re: Hood structure bonding [Re: sawduster] #2878071 01/21/21 09:02 PM 01/21/21 09:02 PM
Joined: Jan 2003 Posts: 18,416 UPPER MICHIGAN, MARQUETTE COUN... N NITROUSN I Live Here
NITROUSN I Live Here N Joined: Jan 2003 Posts: 18,416 UPPER MICHIGAN, MARQUETTE COUN...	Panel bond. Urethane would also work.

Re: Hood structure bonding [Re: NITROUSN] #2878208 01/22/21 07:30 AM 01/22/21 07:30 AM
Joined: Apr 2005 Posts: 4,920 new berlin wisconsin M Mr T2U master
Mr T2U master M Joined: Apr 2005 Posts: 4,920 new berlin wisconsin	DON'T USE panel bond to attach the braces to the hood skin. when panel bond dries it gets rock hard. now your hood flexes and you just made a up dent in your hood. you need something that stays flexible when it dries. 3M might make something designed for this. i don't have the product chart to look this up on hand, my 3M supplier paint rep has it. if I were doing this i would use 3M urethane seam sealer.it's available in a couple of different colors, our shop uses gray. we keep this in stock ALL of the time and it works excellent. i have been using this product for at least 15 years without problems. and it's always in stock our shop gets it in what i call sausage packages and uses a special gun. after looking it up i see it's sold in conventional tubes also. keep in mind it takes a LONG time, a couple of days, for it to fully cure if you apply if thick like you will need in your situation. it will skin over and appear to be dry, but the inner part will still be wet. you try touching it and it will make a mess. 3m Urethane seam sealer. this product isn't cheap so keep that in mind. i have seen similar products made by other companies that is usually cheaper than 3M. i have used a few of them. they are similar but thinner than 3M. in your situation it won't matter. in a pinch as long as the metal is properly prepped you can use windshield urethane also if that is easier for you to get.. this stays flexible when it dries also. perception is 90% of reality

Re: Hood structure bonding [Re: Mr T2U] #2878276 01/22/21 11:17 AM 01/22/21 11:17 AM
Joined: Mar 2010 Posts: 1,061 Atlanta, GA M mgoblue9798 super stock
mgoblue9798 super stock M Joined: Mar 2010 Posts: 1,061 Atlanta, GA	Originally Posted by Mr T2U DON'T USE panel bond to attach the braces to the hood skin. when panel bond dries it gets rock hard. now your hood flexes and you just made a up dent in your hood. you need something that stays flexible when it dries. 3M might make something designed for this. i don't have the product chart to look this up on hand, my 3M supplier paint rep has it. if I were doing this i would use 3M urethane seam sealer.it's available in a couple of different colors, our shop uses gray. we keep this in stock ALL of the time and it works excellent. i have been using this product for at least 15 years without problems. and it's always in stock our shop gets it in what i call sausage packages and uses a special gun. after looking it up i see it's sold in conventional tubes also. keep in mind it takes a LONG time, a couple of days, for it to fully cure if you apply if thick like you will need in your situation. it will skin over and appear to be dry, but the inner part will still be wet. you try touching it and it will make a mess. 3m Urethane seam sealer. this product isn't cheap so keep that in mind. i have seen similar products made by other companies that is usually cheaper than 3M. i have used a few of them. they are similar but thinner than 3M. in your situation it won't matter. in a pinch as long as the metal is properly prepped you can use windshield urethane also if that is easier for you to get.. this stays flexible when it dries also. I second this post. If I had a need for urethane seam sealer for other repairs I would buy that. If not , I would use the windshield urethane.I would also use some folded up sandpaper to prep both sides to remove any loose material before applying. Last edited by mgoblue9798; 01/22/21 11:23 AM.

Re: Hood structure bonding [Re: sawduster] #2878320 01/22/21 12:51 PM 01/22/21 12:51 PM
Joined: Jan 2003 Posts: 15,355 Omaha Ne T TJP I Live Here
TJP I Live Here T Joined: Jan 2003 Posts: 15,355 Omaha Ne	Originally Posted by sawduster 69 RR hood. The bonding is gone. What do I use to re-bond the the hood skin to the under structure? Is it gone completely or loose on one side. Interesting topic that I have often wondered about myself. If completely replacing the bonding material how does one keep the top of the hood flat ?? www.tandmautomotive-omaha.com

Re: Hood structure bonding [Re: sawduster] #2878451 01/22/21 03:46 PM 01/22/21 03:46 PM
Joined: Dec 2003 Posts: 22,696 Bitopia J jcc If you can't dazzle em with diamonds..
jcc If you can't dazzle em with diamonds.. J Joined: Dec 2003 Posts: 22,696 Bitopia	Is hood black and/or insulated in any way, headers, area of country in use, etc? I 'm wonder how much ambient hood temp should be a consideration with the selection of adhesives. I suspect almost all urethane's/epoxies would work, but some might be better based on your conditions. Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.

Re: Hood structure bonding [Re: jcc] #2878521 01/22/21 05:29 PM 01/22/21 05:29 PM
Joined: Aug 2011 Posts: 21 n h S sawduster OP member
sawduster OP member S Joined: Aug 2011 Posts: 21 n h	The bonding is just failed in the center section. Im stripping the hood completely. I marked where the original bonding was and took a picture for reference to apply new. Thanks for the responses. BTW anyone have a picture of the underside with the insulation on it?

Re: Hood structure bonding [Re: sawduster] #2878555 01/22/21 06:52 PM 01/22/21 06:52 PM
Joined: Jan 2003 Posts: 10,713 North Dakota 6PakBee I Live Here
6PakBee I Live Here Joined: Jan 2003 Posts: 10,713 North Dakota	The factory used a plastisol adhesive that was cured when it went through the paint booth. Same material that was used to fill in the plug on the Superbirds. I'm not sure if there is an exact replacement for it. I think I'd use seam sealer as an adhesive. "We live in a time when intelligent people are being silenced so that stupid people won't be offended".

Re: Hood structure bonding [Re: 6PakBee] #2878586 01/22/21 08:17 PM 01/22/21 08:17 PM
Joined: Jan 2003 Posts: 20,765 A collage of whims topside Too Many Posts
topside Too Many Posts Joined: Jan 2003 Posts: 20,765 A collage of whims	The sound pad was attached with clips, look for a series of 1/4" +/- holes punched into the bracing. Real easy if you have the sound pad handy. Correct pad BTW will be thin & contoured, not the puffy crap some guys use.

Re: Hood structure bonding [Re: topside] #2880472 01/26/21 03:36 PM 01/26/21 03:36 PM
Joined: Jan 2003 Posts: 1,232 Chicago, IL P PLUM_72 pro stock
PLUM_72 pro stock P Joined: Jan 2003 Posts: 1,232 Chicago, IL	Many years back, 3M had something called a hood flutter kit. This was an adhesive to repair the broken bond between the sheet metal and the frame. Haven't looked for it in 20 years so not sure if it still exists. 1972 Dodge Challenger

Re: Hood structure bonding [Re: PLUM_72] #2880481 01/26/21 03:50 PM 01/26/21 03:50 PM
Joined: Jan 2003 Posts: 1,232 Chicago, IL P PLUM_72 pro stock
PLUM_72 pro stock P Joined: Jan 2003 Posts: 1,232 Chicago, IL	https://www.lord.com/products-and-solutions/adhesives/fusor-121124-flexible-foam-%28super-fast%29 Last edited by PLUM_72; 01/26/21 03:52 PM. 1972 Dodge Challenger

Re: Hood structure bonding [Re: PLUM_72] #2880571 01/26/21 06:50 PM 01/26/21 06:50 PM
Joined: Jan 2003 Posts: 12,043 State of Confusion hp383 Just a normal tag again
hp383 Just a normal tag again Joined: Jan 2003 Posts: 12,043 State of Confusion	I have had really good results using silicone adhesive. Think RTV but with superior bonding properties. 3M Silicone Adhesive Stuff Join the Penguin Liberation Front!! Stop the Hippo Occupation!

Re: Hood structure bonding [Re: hp383] #2880735 01/27/21 01:20 AM 01/27/21 01:20 AM
Joined: Jan 2003 Posts: 1,908 Nebraska 4 4406bbl top fuel
4406bbl top fuel 4 Joined: Jan 2003 Posts: 1,908 Nebraska	When I called 3m they said to use a product called 3m nvh. He also said if you just have a small area to use plain silicone, never use a panel bond or 2 part seam sealer.

Re: Hood structure bonding [Re: 4406bbl] #2880766 01/27/21 07:48 AM 01/27/21 07:48 AM
Joined: Apr 2005 Posts: 4,920 new berlin wisconsin M Mr T2U master
Mr T2U master M Joined: Apr 2005 Posts: 4,920 new berlin wisconsin	silicone would work. but I WOULD NEVER USE IT. if you ever want to paint it with automotive paint you will get nothing but fish eyes. there are some ways to prevent this, but they add more troubles than what they are worth. YES latex house paint is use over silicone successfully. but i don't use house paint on cars. perception is 90% of reality

Re: Hood structure bonding [Re: Mr T2U] #2880880 01/27/21 01:31 PM 01/27/21 01:31 PM
Joined: Jan 2003 Posts: 1,908 Nebraska 4 4406bbl top fuel
4406bbl top fuel 4 Joined: Jan 2003 Posts: 1,908 Nebraska	[quote=Mr T2U]silicone would work. but I WOULD NEVER USE IT. if you ever want to paint it with automotive paint you will get nothing but fish eyes. there are some ways to prevent this, but they add more troubles than what they are worth. YES latex house paint is use over silicone successfully. but i don't use house paint Good point, nvh paints nice I can confirm that.

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