Inner Hood Brace to Outer Skin- What to Use In Between?

theastronaut

theastronaut

Promoted Users
Looking for suggestions on what to use between the inner hood brace and outer skin on the F100 I'm building. The original material is long gone and appears to have been held in place with staples. I've seen some hoods that look like they have panel adhesive or seam sealer in the gap but that seems like it would be too rigid and possibly show through the outer skin later. Wouldn't it be better for the there to be a floating cushion instead of an adhesive?

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I have a strip of rubber with 3M tape on the back that I could trim down to 1/2" wide to fit, but the flange is lumpy and would need to be straightened for something like this to work. Any other ideas out there?


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Ford and GM in that Era used a asphalt type material kinda like roofing underlay but thicker.I got some through one of the parts houses years ago for a 66 Chevy I was doing but i think it's still available. Came in strips about the width of the channel.
I'll see if I can find it.
 
Is 04274 paintable or is it too soft/flexible for to hold paint? I didn't see that mentioned anywhere on the 3M site. I'm guessing its too soft. I do have a couple of dual cartridge guns.



Chris_Hamilton said:
Here's the Chevy stuff. I don't know if they make a kit for the Fords like they do Chevy but this stuff would work. Original stiff was like I described this stuff is more spongy which should work well. I would imagine you could adapt the Chevy kit to work with your truck.

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The last time I bought one of those kits it ended up not being the original asphalt material you mentioned, it was very firm foam, stiff enough that it had to be shaved down to fit in the gap without pushing a high spot in the outer skin.
 
Exterior painters caulk. It's flexible, can paint over, and has a 50 year life. Squeeze it in the gaps, then clean the edges with a wet/damp towel.
 
MJM said:
Exterior painters caulk. It's flexible, can paint over, and has a 50 year life. Squeeze it in the gaps, then clean the edges with a wet/damp towel.
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With all due respect MJM that will look like dog squeeze. :oops: I've seen attempts at it in person. Latex caulk has no place anywhere around a car.
 
theastronaut said:
Is 04274 paintable or is it too soft/flexible for to hold paint? I didn't see that mentioned anywhere on the 3M site. I'm guessing its too soft. I do have a couple of dual cartridge guns.





The last time I bought one of those kits it ended up not being the original asphalt material you mentioned, it was very firm foam, stiff enough that it had to be shaved down to fit in the gap without pushing a high spot in the outer skin.
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John, here is one of the 3M TDS's. It is mentions that it is paintable. I've always painted over it when using it with something exposed like an underhood, but I've never used it on a high level type build like you are doing. Main thing I used it for was door skins.

 
theastronaut said:
I went ahead and pulled the inner braces out of the hood, there was more rust and damage and fit issues. I'll straighten the edge that had padding from the factory so it's easier to either fit another strip of padding, or a bead of the 3M NVH will look cleaner.

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I have too hand it to you for going that extra mile. That detail took a lot of work.

Well done.
 
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