68' Floor Pan Question

Right at the top of the hump I see some discolouration along the the seam sealer. Is that rust? Rust can grow UNDER the seam sealer. If you see any rust along the edges of seam sealer anywhere, I'd scrap off the sealer and check.

I don't like the idea of bedliner or Herculiner because it's TOO tough. Same as undercoating, moisture can get under it if it's not sticking for some reason then it has the opposite effect of what you're trying to accomplish. The moisture is trapped and will cause degradation. Plus, I don't think it looks right on a vintage car.

You want to stop any rust that is there now and you want to prevent any new rust from appearing should moisture get under your carpet in the future. Is bedliner the right choice?

I prefer cleaning off the metal and then applying some good paint, whether it be epoxy primer with paint on top, Master Series, Por-15 or whatever. Something that you can sand and deal with in the future should you need to. bedliner will be like an undercoating that you might regret is on there down the road. That's just my opinion.