Rear trunk lid rust, How to repair rust for paint Options

[artluvr]

My 1974 914 has the typical bubbling paint on the rear trunk lid due to rust caused by the foam insulation. I have cut out a section on the left side of the lid and removed the foam to treat the rust. Should I replace the foam with something else to give rigidity to the lid? Also, should I go ahead and do the same thing to the right side of the lid, even though there are currently no pin holes there?

I am stripping the car for paint--my first experience. Thank you for any suggestions or experiences.

[boxsterfan]

At that point in a restore, I would do whatever it took to get all the foam out. Did you get the foam out from under the sail panels area and the rear wheel arches (in rear I think)?

Someone else here will have good ideas on what to do with the rigidity.

[artluvr]

At that point in a restore, I would do whatever it took to get all the foam out. Did you get the foam out from under the sail panels area and the rear wheel arches (in rear I think)?

Someone else here will have good ideas on what to do with the rigidity.

Thank you for your response. I was unaware of the foam in the sail panels. No visible pin holes or paint bubbling there. I would have posted photos but haven't figured out how to do that yet.