Well, this is turning into far bigger of a project than I anticipated. Floor was pretty rotted but you couldn't tell because it was sitting on foam. Foam is waterlogged and needs to come out.
Started messing with a DA polisher.
Previous owner replaced sections of the floor but took the easy way and didn't pull the benches or factory foam from 1990.
Foam is deceptive. 1/4" at the top is wet but then seems dry, but if you cut it out the bottom 2" or 3" is a sponge.