I painted my garage floor with resincoat - a two part paint which you mix and paint on and it fully cures after 24 hours. I bought two 5 litre pots and two 1 litre ones to do the job. Chose a lovely tangerine colour. You have to put a primer on first too.
Used one of the 1 litre cans first and it went down well. Then tried a 5 litre can - of course as soon as you mix it it is curing so you've got to paint like the clappers to get it down and it gets progressively harder as you get to the bottom of the can. At the end I was almost trowelling it on. Looked fantastic though, a bit like an abattoir admittedly.
I then covered most of it up with interlocking yoga mats and off-cuts of carpet to keep it warmer in the winter!