Body/paint floor questions

Thanks guys, all very good info.
The "plan" for the interior floor boards was to prime them(after scuffing) when I primed the inside firewall ect.
This is on my 69 vert. Top is off, dash is out, so I can(hopefully) stand in it and spray it(virgin at painting too lol)
Thanks again!
I would lightly scuff and apply something on the interior floor boards. Bottom side Linux sounds good. I don't know if you need seam sealer on the bottom side.