My trunk lid skin is "loose' from the inner skin, so I'm getting some "oil canning" of the skin. I assume that the bonding between the inner & outer skins has let go- it's only 54 years old! I was thinking of injecting some adhesive between the inner & outer skins. Any tips? Obviously nothing that will expand.
3M and SEM both make a 2 part foam/seam sealer that is specifically made for this. I’ll see if I can find it.
3M Flexible Foam, 08463, 200 mL Cartridge https://www.amazon.com/dp/B000PEZ1FK/ref=cm_sw_r_cp_api_i_MTEAAZ2X7DDHFQJ14MQW
