hi christian.
we have just finished painting our climatic wind tunnel and workshop floors with a 2 pack epoxy paint that is superb. it's made by a company called Watco and is called 'epoxy gloss coat solvent free'.
goes on really easily with a roller (cutting in around the edges with a brush) and a 5 litre tin will cover 30 m^2 at a cost of about £100.
we chose a light grey that doesn't show dust much and reflects a lot of light in the work area.
needs a day to harden enough to walk on, but you need to leave it 7 days before it's fully chemical resistant, so plan ahead.