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The dampness will make it tough to get paint to stick I think.
Although its a lot of work I would advise breaking out the old concrete, leveling the earth, putting down visqueen vapor barrier and wire mesh and pouring a new floor.
If that concrete is really 95 years old (I doubt it) it will probably break out pretty easily. Get a large pry bar (6' or so) and start in a soft spot and just get under the slab and pry.
You will spend mostly labor here but you will get a new floor and a vapor barrier. It will add value to the house too.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]
..I also have a 427 Cobra replica with an aluminum chassis.
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