Floor Pan Rust
Symptoms
Visible rust perforation on the underside of the floor. Soft or spongy metal when prodded. In severe cases, you can see daylight through the floor from inside the car.
Cause
Water enters the cabin through deteriorated door seals, windscreen seals, and the firewall. It sits on the floor pans, which have no drainage. Road spray attacks the underside. Seventy years of moisture exposure is relentless.
Fix
Minor surface rust: treat with rust converter, seal, and undercoat.
Perforated floor pans: cut out the rust and weld in new metal.
Reproduction floor pan sections are available from specialists.
A full floor pan replacement on a rotisserie is a major restoration job, budget $3,000-8,000 for both sides.
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