Dual skinned vehicle roof

[Little Jerry]

Hi

I have an old F150 that I have been restoring. The roof has an internal and external skin. It's been metal finished back into good shape but access is difficult in most areas given the dual skins and the fact that I haven't cut the inner skin out. It's mostly rigid now but there are a couple areas that still have some flex that I was hoping to stiffen up.

Any ideas on what I can use? I have limited access - a few holes where interior lamp etc mount. Originally I was thinking like an expandable foam of some sort but I'm reading that can trap moisture and cause rust.

Any one got any ideas?

Regards

Adam

 

[Little Jerry]

It's part of the entire inner structure seemingly one piece all spot welded on...no doubt it could be unpicked but the roof is in good shape now (wont need any filler, some small waves should block out). The flex isn't bad, but not keen to put a shrinking disc to it in the middle given I cant get access if it pulls it in to much.

 

[Ruffian]

Carbon rod to shrink some tension back into the outer skin.