ARRGGH, painting a concrete floor just creates a lifetime of grief the
paint peels easily, everytime something moves over floor.

install a computer muffin fan exhausting to the outside, uses nearly
no energy, end of musty smell.

if you insist on paint then go professionally applied epoxy, at least
its fairly durable.

or tile the floor.

paint? had a house like that, constantly looked bad. repainting makes
thick paint more likely to peel.

i ended up stripping the paint and vinyl tiling floor