Another anti flutter/bonding question - trunk lid skin

Klleetrucking

Promoted Users
'70 GM A Body
My trunk lid skin seems to have lost the bond between it and the inner structure in two small areas, resulting in a tiny bit of flex when I run the long board over the areas.
It shows as a high and has sanded through the epoxy back to bare metal. When pushed on one can hear the skin touch the inner structure, the movement is almost undetectable but it's there. Both the inner structure and skin are almost perfect so I don't want to cut anything apart.

Is there any product thin enough to maybe inject with a large gauge hypo to get the bond back and stop the flexing?
If so, my idea is to inject the "glue" with the inner structure side up then turn it skin side up and lay a sandbag on it to "clamp" the skin down.

Suggestions please.

K. Lee
 
How about seam sealer and apply it like you where packing a wheel bearing with grease, except use your finger to push the sealer in the thousand of an inch gap. Masking tap and paper to protect the areas around the repair as you pushing the seam sealer in.

That's my story and I'm sticking to it. No pun intended.
 
How about seam sealer and apply it like you where packing a wheel bearing with grease, except use your finger to push the sealer in the thousand of an inch gap. Masking tap and paper to protect the areas around the repair as you pushing the seam sealer in.

That's my story and I'm sticking to it. No pun intended.
Good suggestion but, the area I need to address has little to no access.
Along your line of thinking I was considering epoxy primer infused for 24 hours to thicken, drill a 1/16" hole in the inner structure and inject the epoxy primer. Then orient the trunk lid to where the epoxy primer would flow into the gap.

I should've asked this in the opening question.
Where the skin touches the inner structure any gap is unacceptable correct?
 
Where the skin touches the inner structure any gap is unacceptable correct?
Most likely the gap you are concerned about has been like that since it left the factory. Anit flutter, NVH materials are used only to prevent the inner and outer skin from touching and making noise. Not to ensure a perfect even seam between the inner structure and outer skin. Hood, roof and trunk lids will flex some. Some are worse than others. Almost every trunk lid will have a gap between the inner and outer skin at the center. Especially on older vehicles. How they left the factory.
Yours does not sound bad at all. My advice would be don't worry about it. Change paper often, use little to no pressure when blocking and it will be fine. Trying to inject material in the gap is not the solution. Fresh paper, low pressure is. :)
 
As said, NVH is the way to go.
Over the years, everything in the book has been used.
And down the road, problems like expansion
And shrinking has been a significant issue.
 
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