I would definatly recomend using the seam sealer at the frame to floor panel
areas. History shows on our cars the worst areas being the forward footwell
to chassis crossmember area and on 3000s the trunk floor areas.
Remember the old sealer/caulk was a tar based formula that would dry out and
crack( plus flexing of the chassis didnt help much either.) Water gets into
the area between floor panels along with dust and dirt,hold the moisture and
rust out the thin metal floors.
I would do this:
areas that are badly rusted and need floors replaced,
strip/clean/wirewheel/sandblast whatever your means of rust/paint
removal,blow crevises out with air (real good) than treat bare metal with
epoxy primer, weld in new floors or replacement pieces ,seal all seams
inside and under car as original with a good polyurethane automotive sealer
, then paint, those of you desiring PC I would still seal with a clear Poly
seamsealer as painting or powdercoating will not get in between the panels
to protect against corrosion.
Carroll Phillips Top Down Restorations
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